Rei doesn't answer her phone.
Not the official one, which I don't have the number for and wouldn't call anyway. The number Nishida gives me when I ask, standing on the Kōenji pavement with both phones in my jacket and the waterproof bag under my arm, rings four times and goes to a voicemail that doesn't identify itself. I don't leave a message. Messages are records and records are problems and I have enough of both already.
I call Nishida back.
"She's not answering."
"She rarely does when she's working something." A pause. "Try the Mizore angle. She had a regular place. A kissaten near Kagurazaka where she took sources she didn't want seen in official locations. Rei knew it."
"You know a lot about how Rei works."
"Saitō knew a lot about how Rei works," he says. "I knew Saitō."
He gives me the address and ends the call before I can ask him what else Saitō knew that I'm going to need later.
The kissaten is called Hoshino. It's on a narrow Kagurazaka side street that angles away from the main road in the particular way of old Tokyo streets, built before anyone decided grids were a good idea. The exterior is dark wood and frosted glass, the kind of place that has been exactly itself for forty years and intends to continue. A handwritten sign in the window lists the hours. They opened at seven. It's not yet eleven.
I go in.
Rei is in the back booth.
She's not alone.
The woman across from her is somewhere in her fifties, short hair going gray at the temples, a jacket that belongs to someone who works in an office but has stopped caring about the office. She has a cup of coffee she isn't drinking and both hands flat on the table and she's speaking quietly with the focused intensity of someone delivering information they've been sitting on for too long.
Rei sees me before I reach the booth.
Her expression does three things in rapid sequence. Recognition, assessment, something that isn't quite irritation but lives in the same neighborhood. She holds up one finger without looking away from the woman across from her.
I sit at the counter. I order coffee I don't need. I watch them in the mirror behind the counter without appearing to watch them.
The conversation takes six minutes. At the end of it Rei closes her notebook, and the woman stands and puts on her jacket and leaves through the front without looking at me. She moves like someone who has spent years perfecting the art of not being memorable.
Rei slides into the seat beside me at the counter rather than calling me back to the booth. Close enough to speak quietly. Not close enough to suggest anything to anyone watching.
"You were supposed to go to Nakameguro," she says.
"I found the cache."
A pause. "Nishida told you about the bookshop."
"He told me enough." I put Saitō's phone on the counter between us, screen up, the message thread from Minami visible. I watch her look at it.
She looks at it for a long time.
Not the messages specifically. The contact name. The single kanji. She looks at it the way you look at something you hoped wouldn't appear but prepared for anyway, the specific expression of a contingency becoming actual.
"You know that name," I say.
"I know that character." She doesn't touch the phone. "Where did you get this."
"Tada brought it to the bookshop. He retrieved it from the apartment before the police arrived." I watch her face. "Ryūsei swept the scene before they called it in. They staged everything and then reported it."
"I know." She picks up her coffee. "The forensics lead is mine. He flagged the timeline inconsistency in the blood distribution before Ando saw the report. Someone repositioned the body after death. The lividity pattern doesn't match her final position." She drinks. "I filed it in my personal notes before I handed the official file over."
"The woman who just left."
Rei sets down her cup. "A forensics consultant. Independent. She's going to run parallel analysis on the photographs I kept copies of." A pause. "Unofficially."
I look at her. She's building a shadow investigation. She's been building it since she walked out of the precinct with her notebook, methodical and quiet and operating completely outside the institutional structure that just removed her from the case. She didn't need me to tell her the scene was staged. She already knew.
"Read the messages," I say.
She reads them. All three. She reads the third one twice, the same way I did, and her jaw tightens on the second reading in a way that tells me the content isn't the surprise. Something else is.
"The timestamp," she says.
"Twenty-three fourteen. Forty-three minutes after estimated time of death."
"Minami knew she was dead within the hour." Rei puts the phone down. "That's not external intelligence. That's not someone who heard through channels." She's quiet for a moment. "That's someone who was close enough to know in real time."
The kissaten is quiet around us. Soft music from somewhere, old jazz, the particular intimacy of a place that has absorbed decades of private conversations. A couple near the window, talking about something ordinary. The counter staff moving with the unhurried efficiency of people who have made thousands of cups of coffee and will make thousands more.
"Who is Minami," I say.
Rei wraps both hands around her cup. A gesture that looks like warmth but is, I'm reading correctly, the physical expression of a decision being made about how much to say.
"Mizore had a source inside Ryūsei," she says finally. "She never gave me a name. She was careful about that, she kept source identities completely separate from the documentary evidence. Firewall." A pause. "But she told me the source had been inside for more than a decade. That they were highly placed. That they had been building a parallel record of Ryūsei's financial operations independently of Mizore's investigation."
"The drive," I say.
"I didn't know about a drive. I didn't know about a cache." She looks at the phone. "I knew there was a source. I knew the source had given Mizore enough to begin the financial thread. And I knew that Mizore had set up a meeting with someone who could confirm the human layer connecting Ryūsei to Tomura."
"Saitō."
"Yes." She's quiet. "What I didn't know, what Mizore never told me, was whether her source and Saitō's contact were the same person."
I look at the kanji on the phone screen. South. A direction and a person and a decade of parallel record-building inside an organization that kills people for knowing the wrong things. Someone who was close enough to know Mizore was dead within the hour.
"They are," I say.
Rei looks at me.
"Minami was Mizore's source," I say. "And Minami was Saitō's contact. They were running parallel tracks into the same organization and Minami was the point where the tracks connected." I pause. "Which means Minami knew about both of them. Knew they were both moving toward the same place from different directions."
"And knew they were both going to be targeted on the same night," Rei says quietly.
The sentence settles between us.
If Minami knew the attack was coming, and sent warnings Saitō didn't receive in time, then Minami tried to prevent it. That's one interpretation. The other interpretation is that Minami is the reason the attack was possible at all, the single point of knowledge who connected Mizore's investigation to Saitō's identity to Tomura's awareness.
"You don't trust them," I say.
"I don't trust anyone I haven't verified." She looks at the phone. "And I can't verify someone I can't identify."
I pick up the phone. I look at the three messages again. The first sent four days ago: They know about the journalist. Move the cache. Saitō didn't move the cache. Either he didn't see the message in time or he chose not to run, which would be consistent with someone who had spent eighteen months holding his ground rather than retreating.
The second, two days ago: Tomura has the meeting location. You need to run. Again. Run. Minami trying to pull him back from something that was already in motion.
The third, forty-three minutes after Mizore died: I'm sorry. I tried to warn you in time. The drive has everything. Use it.
Use it. Not find it, not retrieve it. Use it. Minami knows about the bookshop. Minami knows where the drive is. Which means either Saitō told them, or Minami has been watching Saitō closely enough to know.
Either way, Minami is waiting.
Waiting for a dead man to respond to a message sent at twenty-three fourteen on the night everything went wrong.
I turn the phone over in my hands. Then I type, slowly, in Japanese I apparently know how to write as fluently as I speak it: I have the drive. I'm not who you think. But I need to know who you are.
I show it to Rei before I send it.
She reads it. Her expression is careful, controlled, the professional surface doing its work. Underneath it, something that might be fear or might be the thing adjacent to fear that investigators feel when a case opens into something larger than the container they built for it.
"If Minami is still inside Ryūsei," she says, "and Tomura is looking for the leak, sending that message puts them at immediate risk."
"Not sending it means we have a drive we can't fully interpret without someone who knows the internal architecture it documents." I hold her gaze. "Minami built that record for a decade. They know what's on it. We need them."
A silence.
"If Tomura identifies Minami before we do," she says, "they're dead."
"Yes."
Another silence. The jazz plays softly. The couple near the window laughs at something.
Rei looks at the message on the screen. At the words I've written in a language that isn't mine in a body that isn't mine to a person neither of us can verify.
"Send it," she says.
I send it.
We wait.
The response comes in forty seconds. Fast enough that Minami was already watching the phone, already waiting, already sitting somewhere in Tokyo with a screen in their hands and the particular alertness of someone who has been operating in the margins of survival for long enough that fast responses are reflex.
Four characters.
I show Rei the screen.
She reads it. Her face does something I haven't seen it do before. Not the professional control, not the careful neutrality. Something that moves through her quickly and leaves a different quality of stillness behind it.
I look at the screen.
The message says: I know. I've been watching you since Kōenji. We need to meet. Tonight. Alone. There's a name on the drive you're not ready for.
I read the last line again.
There's a name on the drive you're not ready for.
The kissaten hums softly around us. Somewhere outside, Tokyo goes about its ordinary morning, indifferent and enormous and full of people who don't know that a decade of buried evidence just sent its first message to the wrong man in the right body.
I put the phone in my pocket.
I don't look at Rei.
I look at the counter and the cold coffee in front of me and I think about a name I'm not ready for, on a drive in a waterproof bag under my arm, in a city I arrived in eight hours ago with blood on my hands.
What did you know, Saitō.
What did you know that was worth all of this.