Chapter 97: Thirty-Seven Thousand Feet

The Denver layover was forty-seven minutes. Sarah found a corner near Gate B22 where the ambient noise from the concourse created enough white noise to make a phone call without shouting, and she called her father.

He picked up on the second ring. That was wrong. David Chen had never been a second-ring man—he was a sixth-ring man, a let-it-go-to-voicemail man, a man who treated incoming calls with the suspicion of a retired detective who had spent thirty years getting calls that were never good news. Second ring meant he'd been holding the phone. Waiting.

"Sarah."

"Dad."

"You're at the airport." Not a question. He'd been tracking the flight on his phone, she realized. Lying in his hospital bed in Woodbridge with the blood thinners running into his arm and the cardiac monitor ticking along, and he'd pulled up the flight tracker and watched the dot move from Havre to Denver.

"Layover. We fly out in forty minutes."

"And?"

She leaned against the wall. A family walked past with carry-on bags and a toddler who was crying about something with complete commitment. The crying faded as they moved toward their gate. Sarah looked at the departure board. Denver to Dulles. 3:47 PM.

"She's there, Dad."

Silence on the line. Not a pause. Silence. The kind where you could hear the room the other person was in—the hospital sounds, the hum of medical equipment, the air of a place where machines kept people alive.

"She's alive," Sarah said. "I saw her. I talked to her."

David Chen made a sound. Sarah had heard a lot of sounds in her career—the sounds people made when they received news that rearranged everything they understood about their lives. The sound of parents told their child's body had been found. The sound of suspects who realized the evidence was overwhelming. The sound of witnesses who learned they'd been wrong about what they saw.

Her father's sound was none of those. It was smaller. A breath that caught, then released, then caught again—the respiratory pattern of a man whose body was trying to process something his brain had already accepted years ago as impossible. He'd known since Sarah told him. But knowing and hearing were different animals.

"Is she—" He stopped. Started again. "Is she okay?"

"She's healthy. She's been living in Montana. She has a life there, Dad. A practice—paper arts. She's been making paper."

"Paper." He said it like he was testing the word. Like it might mean something different than what it usually meant.

"She agreed to come back. Two days. She needs to sort out some things at the property, and then she's coming east."

"Two days."

"Maybe less."

Another silence. Sarah could hear the cardiac monitor now—a steady, regular beep that meant the blood thinners were doing their job and his heart was doing its job and his body was cooperating with the medical infrastructure even while the rest of him was somewhere else entirely.

"Sarah," he said. His voice had changed. Not the detective voice. Not the father voice she was accustomed to—the measured, careful voice of a man who had spent twenty years calibrating how much emotion he allowed into conversations about his missing daughter. This was something underneath both of those. Older. Less constructed. "I need to tell you something before she gets here."

"Dad—"

"In 2006. When I found the evidence in Hayes's clearing. The fiber sample, the hair. I didn't just fail to follow up. I looked at it. I looked at what I'd found, and I recognized the hair." His breathing. The monitor. "It was Emily's. I knew it was Emily's because I'd pulled her hairbrush from her room the week she disappeared and compared it myself. I had the comparison in my hand. And I chose not to file it."

Sarah closed her eyes. The concourse noise continued around her—boarding announcements, the murmur of travelers, the crying toddler now distant but still audible. "I know, Dad."

"You know."

"I've known since Winchester. The evidence in Hayes's workshop told the same story."

"I thought—" He stopped. The monitor beeped. "I thought if the investigation stayed open, if there was still a chance she was alive somewhere, then the case stayed active. If I filed the hair match, it connected Emily to Hayes, and every investigator in the state would have concluded she was dead. The case would have been reclassified. The search would have stopped."

"You kept the search alive by hiding evidence that would have ended it."

"Yes."

"And in the twenty years since, Hayes killed thirty-one people."

The silence this time was different. Heavier. The silence of a man who had done the arithmetic many times and had never found a sum that absolved him.

"I know," David Chen said. "I know what it cost."

Sarah opened her eyes. Gate B22. The departure board. Forty minutes to boarding. Marcus was somewhere in the concourse getting food, giving her the space she'd needed for this call without her having to ask for it.

"She's going to have questions too," Sarah said. "When she gets here. About what you knew and when."

"I'll answer them."

"All of them, Dad. Not the version you've been carrying. All of it."

"All of it." A pause. "Is she—Sarah, does she look—"

"She looks like Mom," Sarah said. She hadn't planned to say it. But it was true. The cheekbones, the way she held her hands when she was thinking, the specific angle of her jaw when she was deciding whether to say something difficult. Emily at thirty-seven looked more like Lin Chen than Sarah had expected, and the recognition had landed in a place Sarah didn't have professional language for.

David's breathing changed again. The monitor beeped, steady, unbothered by the fact that the man it was attached to was crying in a hospital bed in Woodbridge, Virginia, at 2:15 in the afternoon on a day when his missing daughter turned out to be alive and folding paper in Montana.

"Two days," he said.

"Two days."

"I'll be here."

She ended the call. Stood against the wall for a moment with the phone in her hand, looking at nothing. A gate agent made a boarding announcement for a flight to Minneapolis. Someone dropped a coffee cup and swore. The ordinary sounds of an airport on a Tuesday afternoon, which was a day that had contained a conversation Sarah would carry for the rest of her life.

Marcus appeared with two sandwiches in clear plastic containers and a bottle of water. He handed her one of each without asking what she wanted, which meant he'd chosen based on eight years of knowing what she ate when she was running on adrenaline and hadn't slept enough.

"Turkey," he said. "They were out of the chicken."

"Thanks."

They ate at the gate. The sandwich was adequate. Sarah watched the planes on the tarmac—the precise choreography of ground crews and baggage carts and fuel trucks that kept an airport functional. Systems. Processes. The machinery that kept everything running whether you watched it or not.

"You called your dad," Marcus said.

"Yeah."

"How'd he take it?"

"He cried. And then he told me he matched Emily's hair to the evidence in 2006 and chose not to file it."

Marcus set his sandwich down. Looked at her. The partner's look—the one that said *I am processing this information and deciding what it means for the case and for you simultaneously.*

"He knew she was connected to Hayes. Twenty years ago. And he buried it."

"He buried it to keep the case open. If the hair connected Emily to Hayes, every investigator would've assumed she was dead. The active search would've been downgraded." Sarah took a drink of water. "He made a choice. It was the wrong choice for thirty-one people. It might have been the right choice for Emily."

"That's not how the law works."

"No. It's not."

Marcus picked up his sandwich again. Took a bite. Chewed. The deliberate eating pattern of a man who was thinking through a problem that didn't have a clean answer.

"You know what Reyes is going to ask," he said.

"Reyes is going to ask a lot of things."

"She's going to ask about the gap. Emily knew Hayes was killing people. She knew, and she left, and she didn't report it." He looked at Sarah. "Twenty years of not reporting. That's not a gray area, Chen. That's accessory after the fact, at minimum. Misprision of a felony, for certain. Depending on what she knew and when, it could be conspiracy."

"She was seventeen when she found out."

"She was seventeen when she left. She's been thirty-seven for a while now. At some point in those twenty years, she had the capacity to pick up a phone."

Sarah looked at the departure board. Their flight was on time. "I know."

"And your father—concealing evidence in a federal investigation. That's obstruction. Even if the statute has run, Reyes will want the full picture."

"I said I know, Marcus."

He let it sit. The gate area was filling up now—business travelers and families and solo fliers arranging themselves in the hierarchy of boarding groups. Sarah watched a woman across the aisle reading a paperback thriller with a dark cover and a single bloody handprint on the front. The woman was about thirty pages in and fully absorbed.

"What are you going to do?" Marcus said.

"About which part?"

"The part where your sister is a material witness who is also potentially a defendant, and your father is a retired detective who obstructed an investigation, and you're the lead profiler on the case that involves both of them."

Sarah finished the water. Crushed the bottle flat in her hand—the habit she had when she was thinking and needed her hands to do something. "I'm going to write my report. I'm going to give Reyes every piece of evidence I have, including what my father told me on this call. And I'm going to recommend that Emily's cooperation be handled through a proffer agreement that gives her limited immunity in exchange for her full statement."

"That's the professional answer."

"That's the only answer I have right now."

"And the personal one?"

She looked at him. Marcus Drake, who had a wife he was separated from and a daughter he saw on weekends and a career that had bent itself around Sarah Chen's obsessive pursuit of a case that turned out to be something other than what either of them had thought. Marcus, who had said *I'm coming* without being asked twice.

"The personal answer is that I found my sister," Sarah said. "And I don't know what happens next. And that's not a feeling I'm used to operating inside."

"Yeah," Marcus said. "I know."

They boarded. Sarah took the window seat. Marcus took the aisle. The middle seat stayed empty, which was the kind of small logistical mercy that felt disproportionate given the size of everything else.

At thirty-seven thousand feet, somewhere over Kansas, Sarah opened the case file on her tray table. The file had grown considerably since the first day in Winchester—seven weeks of evidence accumulation, interview transcripts, forensic reports, and the accumulated weight of a case that had consumed every resource the BAU had allocated to it. She turned to the section Tommy had compiled on Hayes's archive.

The sixty photographs from the Montana coordinates. The outdoor workspace. The paper. And in the middle of the stack, the photograph of the woman at the table with her back partly to the camera.

Emily. Working. Building something from the wreckage of what Hayes had taught her.

Sarah's phone buzzed. She glanced at it—a text from Tommy.

*DNA prelim is in. Call when you land.*

She stared at the text. DNA results weren't supposed to be back for three more days. The Richmond lab had a processing queue and federal cases didn't automatically jump it, regardless of what Reyes's office might prefer. An early result meant someone had expedited. Someone with enough pull to move a genetic analysis ahead of the queue.

Walsh. It had to be Walsh.

Sarah typed: *Confirm or deny?*

Tommy's response was immediate: *Confirm. Full match. Emily Chen is the source for the pre-2012 collagen stock. Tanaka's running the post-2012 samples now but preliminary says different composition—consistent with the synthetic process Margaret described.*

Sarah read the text twice. Set the phone on the tray table next to the case file. The plane hummed around her—the white noise of pressurized air and jet engines and the hum of a metal tube carrying a hundred and forty people across the country at five hundred miles an hour.

The DNA confirmed what they already knew. Emily had provided the biological material for Hayes's paper before 2012. After 2012, the synthetic process Margaret described. Two distinct periods, two distinct compositions, and a genetic signature that connected Sarah's sister to the medium a serial killer had used for two decades.

Marcus was watching her. He'd seen her check the phone, seen the way she read the text twice.

"Tommy," she said.

"The DNA."

"Full match. Emily's the source for the pre-2012 stock."

Marcus leaned his head back against the seat. Looked at the ceiling of the plane—the overhead bins, the reading lights, the call button nobody ever pressed. "So now Reyes has forensic confirmation that Emily provided biological material to a serial killer."

"To an artist. Who was also a serial killer. The distinction matters."

"The distinction matters to you. A jury is going to hear 'she gave him her body's collagen and he used it to make the paper he wrapped around his murder victims.'" Marcus kept his voice low. The man across the aisle had headphones on, but operational security was operational security. "That's not a nuance-friendly narrative."

"Which is why Emily's cooperation is essential. Her testimony establishes the timeline—when she learned about the murders, when she stopped providing material, when she developed the synthetic alternative. The narrative isn't 'she helped him kill.' The narrative is 'she tried to fix what she could once she understood.'"

"At seventeen, without telling anyone."

"At seventeen. Yes."

The plane descended through a cloud layer and the turbulence shook the tray table. Sarah caught the case file before it slid. Held it flat against the surface. The photograph of Emily on top, the woman at the table, the fold in process.

"Chen." Marcus's voice. The voice he used for the things that were not about the case but were about the person working it. "When she gets here. When Emily walks into whatever room Reyes puts her in. You can't be there."

"I know."

"Not because of protocol. Because you being there changes what Emily says. She'll perform for you. She'll protect you. She'll frame everything around what she thinks you need to hear instead of what actually happened."

"I know."

"Do you? Because forty-eight hours ago you flew to Montana specifically so you could be the first person she saw."

Sarah looked at him. The directness of the comment. Marcus didn't soften things when the case required sharpness, and the case required sharpness now.

"I went to Montana because a voluntary witness is more likely to cooperate if approached by a family member than a tactical team," Sarah said. "That's profiling. That's what I do."

"That's what you told Walsh."

"It's also true."

"Both things can be true, Chen. That's not the problem." He shifted in the aisle seat. His knee against the seat in front of him—Marcus was too tall for economy class and had been too tall for economy class for the entire eight years they'd been flying to crime scenes together. "The problem is what happens when the professional answer and the personal answer stop being the same answer. Because right now they're aligned. Emily cooperates, gives her statement, gets some version of immunity. That works for the case and it works for you. But if Emily's statement contains something that doesn't work for you—"

"Then I deal with it."

"Do you?"

"I've been dealing with it for seven weeks."

Marcus went quiet. The plane leveled off. The seatbelt sign stayed on. Somewhere behind them, a child asked a parent a question that the parent answered with the worn patience of someone who had been answering questions for hours.

Sarah turned back to the case file. Closed it. Put it in her bag under the seat in front of her.

"When we land," she said, "I need to call Reyes about the DNA result. Then Tommy for the full report. Then I need to start drafting the proffer agreement framework before Reyes does it herself, because Reyes's version will not include the provisions Emily needs."

"You're going to draft a legal document for your own sister's immunity deal."

"I'm going to draft a recommendation. Reyes drafts the document. The distinction matters."

"You keep saying that. The distinction matters." Marcus looked at her. "At some point, Chen, the distinctions are going to run out."

The plane began its descent into Dulles. The Virginia landscape appeared through the window—green, dense, humid even in early spring, nothing like the flat brown enormity of Montana. A different world. The world Sarah had built her career in, the world Emily had left, the world they were both about to occupy at the same time for the first time in twenty years.

Sarah watched the ground get closer. The geography of northern Virginia—the highways, the government buildings, the suburban sprawl that fed the federal machinery she had devoted her professional life to serving.

Somewhere in that landscape, AUSA Reyes was reading a DNA report. Somewhere in that landscape, David Chen was lying in a hospital bed with tears drying on his face. Somewhere between Montana and here, Emily was sorting through twenty years of a life she'd built on a choice she'd made at seventeen, preparing to leave it.

The wheels touched the tarmac. The plane decelerated. The seatbelt sign went off and everyone stood up at once, reaching for overhead bins, checking phones.

Sarah's phone rang. Tommy.

"Chen, I have the full report from Richmond," Tommy said. "The pre-2012 match is definitive. But there's something else. Tanaka ran the post-2012 samples—the synthetic stock—and she found a secondary component. Not collagen. Plant-based. But the processing method is identical to Hayes's technique."

"Meaning Emily learned his method and replicated it without the human material."

"Meaning Emily's synthetic paper is a direct derivative of Hayes's process. Reyes is going to argue that constitutes intellectual property derived from criminal activity. There's precedent—Son of Sam laws, proceeds-of-crime statutes. If Emily's paper process is legally considered derived from Hayes's methodology, and Hayes's methodology is inseparable from the murders—"

"Then Emily's entire body of work is potentially tainted."

"That's Reyes's argument. She called twenty minutes ago. She's not waiting for Emily to arrive. She's filing a preservation order on the Montana property."

Sarah stood in the aisle of the plane. Marcus beside her, reading her face, the carry-on bags shuffling past them in the slow procession toward the exit.

"Tommy," she said. "How long until the order is filed?"

"Reyes said end of business today."

End of business. Five o'clock Eastern. Three hours.

Sarah looked at Marcus. He was already pulling out his phone.

"Call Walsh," she said. "Tell her we need an emergency consult before Reyes files that order. If Reyes goes in with a preservation order before Emily arrives voluntarily, Emily will know the institution got there first. And she'll disappear again."

Marcus dialed. Sarah walked up the jetway into the terminal, the case file in her bag and the phone in her hand and three hours between her sister's voluntary cooperation and the federal government's decision to treat her life's work as evidence.

The distinctions were running out.