Rei stares at the message for three seconds.
Then she does something I haven't seen her do yet. She moves fast. Not the controlled efficiency of someone executing a plan. The sharp, economical speed of someone responding to a threat before the threat finishes arriving. She's at the window in four steps, checking the street below through a gap in the curtain, her phone already to her ear calling Nishida before I've fully processed what's happening.
I look at the message again.
I know about Minami.
Four words that could be a threat or a warning and the difference between those two things is the difference between thirty-one hours and no hours at all.
Nishida picks up on the second ring. He was awake. Of course he was awake.
"Unknown sender," Rei says. "Tokyo prefix. Four words." She reads them. A silence on the other end that lasts two seconds. "Yes. Run the prefix." She waits. Another silence, longer. Her expression doesn't change but her hand tightens on the phone. "When?" A pause. "All right."
She ends the call.
She turns from the window.
"The prefix is a burner," she says. "Purchased in Shinjuku forty-eight hours ago. Nishida can't trace the buyer without a formal request and a formal request leaves a record." She pauses. "But the purchase location narrows it."
"Shinjuku," I say. "Forty-eight hours ago."
"The day before the murder. Someone bought a burner in the same ward as the apartment, two days before everything happened." She looks at the phone on the table. "Someone who was planning to need an untraceable line."
I think about the bookshop. Tada standing in the doorway with the friendly expression that wasn't friendly. The phone he returned, the tracking component in the back panel, the decision to leave without the drive. A man who has been making consecutive deviations from his instructions since the moment he arrived in Kōenji.
"It's Tada," I say.
Rei looks at me.
"He bought the burner before the murder. Before he was sent to Kōenji. Before he had any official role in the cleanup." I pause. "He bought it because he knew what was coming and he wanted a line that wasn't connected to Ryūsei." I look at the message. "He's been preparing his own deviation for two days."
Rei is quiet for a moment. Thinking, not disagreeing.
"If Tada knew about the operation in advance," she says carefully. "If he knew what Tomura was planning for the night of the murder. Then he's not just a cleaner who made an unexpected call in a bookshop." She pauses. "He's someone who understood the full shape of what was happening and has been deciding for two days what to do about it."
"Same position as Minami," I say. "Different organization."
"Not quite the same. Minami has seventeen years and a complete evidence record and a condition she negotiated at a cemetery at midnight." Rei looks at the message. "Tada has a burner phone and four words sent at 3:42 in the morning."
"And he left without the drive."
She picks up her phone. "I'm going to reply."
"You don't know who you're confirming yourself to."
"He already knows about Minami. He sent the message to my phone, not yours. He knows I'm in this, which means he either followed you from the cemetery or he's been tracking this situation closely enough to identify my involvement independently." She looks at the screen. "Either way the confirmation is already his. Replying gives us communication. Not replying gives us nothing."
She types: Who are you.
Simple. Direct. The economy of someone who doesn't want to give more than she takes.
The response comes in forty seconds. The same forty-second window as Minami's first response from the kissaten. People who are ready to communicate respond fast.
You know who I am. Tell the person wearing Saitō's face that Yamamoto identified Minami this morning. Not from the cemetery. From something else.
I read it over Rei's shoulder.
Not from the cemetery. From something else.
Which means the Yanaka meeting wasn't compromised by observation. Minami's cover inside Ryūsei was blown through a different thread entirely, and Tada knows what that thread is, and he's using a burner phone at 3:42 in the morning to warn us about it.
Rei types: What thread.
The response takes longer this time. Ninety seconds. Someone choosing words carefully.
When the SIS filing slot opened, it triggered an automatic notification to the Metropolitan Police liaison office. Yamamoto saw it within the hour. He ran a financial audit on all active Ryūsei accounts looking for anomalies that would explain why SIS was looking. He found a dormant routing structure that hasn't moved in fourteen months. He traced the structure to its origin inside the organization.
I read it twice. Then I look at Rei.
"Minami's documentation," I say. "She's been building a parallel financial record for seventeen years. The record exists somewhere. It has to route through something, storage, access, transmission. Seventeen years of internal documentation doesn't exist in a vacuum."
"Yamamoto found the storage structure," Rei says.
"He found the edges of it. He doesn't have the content or he'd have moved already." I think about the drive Minami handed me at the cemetery. The weight of it. Seventeen years of careful construction in a piece of hardware small enough to fit in a jacket pocket. "He knows the structure exists. He doesn't know it's already out."
Rei types: Does Yamamoto know Minami's identity.
Thirty seconds.
Not yet. He knows the routing structure. He's tracing it. He has analysts working backward through the account history. At current pace he identifies the source account holder in six to eight hours.
Six to eight hours.
It's 3:47 in the morning. Six hours puts us at 9:47. Eight hours puts us at 11:47.
The SIS filing window closes in thirty hours. Kuramoto said the Ministry of Justice slot holds for forty-eight hours from the meeting, which was late afternoon yesterday. Thirty hours remaining, approximately.
If Yamamoto identifies Minami before the filing is complete, Minami is dead. Not in the metaphorical sense of an investigation collapsing. In the direct and immediate sense of a person inside an organization that has already killed twice this week to protect itself.
Rei types: Why are you telling us this.
The longest pause yet. Two full minutes. I stand beside Rei at the table and we both look at the screen and the three dots that appear and disappear twice before the message arrives.
Because I was in the apartment the night of the murder. I was the second actor. I was there to finish what the strangulation started and I didn't finish it. I've been deciding what that means for two days.
The room is very still.
I look at the words. The second actor. The person who positioned Mizore's body. The person who put the knife in Saitō's unconscious hand and arranged the scene and then left without completing the second objective.
Without completing Saitō.
Tada was in the apartment and Saitō was supposed to die there and Tada didn't finish it and has been carrying that decision for two days on a burner phone purchased in Shinjuku while the case built itself around him.
Rei's hand on the phone is very steady.
She types: You staged the scene.
Yes.
You positioned the body.
Yes.
You put the knife in his hands.
Yes.
A pause. Then:
I didn't kill her. Tomura's man did. I arrived after. My job was the staging and Saitō. I did one of them.
Tomura's man. A third actor. Someone I haven't accounted for yet, someone who arrived before Tada and killed Mizore and left Saitō incapacitated and then left, leaving the staging to Tada as the next layer.
A structured operation. Layered, compartmentalized, each person knowing only their piece of it.
Tada's piece was the ending and he didn't deliver it.
I take the phone gently from Rei's hand. She lets me. I type: In the bookshop you asked if I was in there. What did you mean.
Twenty seconds.
I've seen people come back from things they shouldn't come back from. I wanted to know if Saitō was one of them. The eyes were wrong. I've looked at Saitō's eyes for four years. Whatever is in them now is different.
Is he gone.
I look at the screen. The same question Minami asked at the cemetery. Two people from completely different positions asking the same question about the same man in the space of a few hours.
I type: I don't know. But the body remembers him.
A pause.
That's enough for me.
I hand the phone back to Rei. She reads the exchange. She reads it with the expression she uses for evidence she's deciding how to classify.
"He's not a source," she says. "He's a witness to staging. He's a witness to a conspiracy to commit murder. He's an accessory after the fact to Mizore's death and an accessory to the attempted murder of Saitō." She pauses. "He's also the person who chose not to complete the job and has been warning us since Kōenji."
"Do we trust him," I say.
"We don't need to trust him. We need to use him." She looks at the message thread. "If he testifies to the staging, the framing of Saitō collapses completely. The murder charge dissolves. Tomura's operational role in Mizore's death is directly evidenced by a witness who was in the apartment." She pauses. "And Yamamoto authorized the operation that Tomura ran. Tada's testimony connects them both."
"He'd be testifying against Ryūsei."
"Yes."
"They'll kill him."
"They'll try." She looks at the screen. "Kuramoto can put him in protective custody the moment the SIS investigation is formally opened. He becomes a protected witness inside the filing structure." She picks up the phone and types: Can you testify to everything in that message.
Ten seconds.
If you can keep me alive long enough to do it.
She types: We can. But we need to move now. Six hours before Yamamoto traces Minami. We need to file before that happens.
I know. That's why I'm awake at 3:42.
Rei looks at me. The lamp between us, the submission package on the table, twenty-nine hours left in the window and a clock that just shortened to six.
"Wake Nishida," I say. "Get Kuramoto on the phone."
"Already." She's dialing. "We're not filing in thirty hours. We're filing at dawn."
She puts the phone to her ear and I look at the submission package and I think about the specific shape of a situation that has just compressed from manageable to immediate and I think about an economics student from Paris who has been awake for twenty-two hours in someone else's body trying to outrun a timeline set by the most powerful police official in Tokyo.
Kuramoto picks up.
Rei says: "We need to file at dawn. I'll explain on the way. Meet us at the Kasumigaseki entrance in forty minutes."
She ends the call before he answers.
She looks at me.
"Can you run," she says.
"In these legs," I say, "apparently yes."
She almost smiles. Doesn't quite. The shape of it in the lamplight, brief and there and gone.
"Then let's go," she says.