On day four, Marco asked her what she was working on.
It was a reasonable question. They were partners; they talked about their cases. She had mentioned the Krauss tip four days ago and then, from his perspective, gone quiet on it. She had been at her desk more than usual, had taken two long lunch breaks that she hadn't explained, had been, in short, behaving like someone who was working something she wasn't ready to share.
He would have noticed. Marco noticed everything. It was why she'd wanted him as a partner in the first place.
"Krauss background," she said. "Building out the threat assessment before we decide whether to elevate it."
"What have you got?"
"Financial irregularities. He flagged something internally, got suppressed. Might be the motive."
"Want me in?"
This was the question she had been anticipating. The natural, partnership answer was yes. The answer that the informant had obliquely warned her against was also yes.
"Give me another day," she said. "I want the thread cleaner before I hand you half of it."
He looked at her for a moment. Not suspiciously — Marco's expressions weren't structured that way. But attentively.
"Are you all right?" he said.
"Tired," she said, which was true.
He nodded and went back to his case. She watched the back of his head for a moment and thought about four years and three life-trusting occasions and the extremely specific feeling of not knowing whether someone you cared about was a person you could tell the truth to.
She went back to her notes.
---
The Bellhaven acquittal who had gone into the advisory position was named Coran Veith. Forty-four. Former head of a mid-tier brokerage that had been a peripheral actor in the Bellhaven laundering scheme — implicated, tried, acquitted on a technicality that Lena now understood, reading the original charge documents, had been more significant than the contemporaneous reporting suggested.
The charge had failed because a key piece of evidence had been ruled inadmissible. The evidence had been ruled inadmissible because of a procedural error in its collection. The officer who had collected it was a detective on loan from another unit for the Bellhaven task force.
She checked the officer's name.
It was not Marco.
She sat with this for a moment — the particular quality of being relieved about something you were ashamed to have suspected.
Then she kept reading, because exonerating one person did not explain who the informant was or what they knew, and she was running out of days.
---
The financial thread tightened on day five.
She found the connection through a compliance audit report that had been filed, and then quietly archived, eight months ago. The audit had been conducted by Vivienne Strand's team. It had flagged the same sequence of transactions that Krauss had later noticed. It had been reviewed, assessed as a "potential irregularity requiring further monitoring," and then — according to the timestamp — closed out the same day it was filed.
Strand had written both the flagging assessment and the closure assessment. They were four hours apart.
Four hours was not enough time to conduct the investigation that would have been required to formally close a flagged irregularity.
Lena pulled Strand's calendar for that day. Corporate calendar records were not easy to subpoena on short notice, but she had a contact in the financial crimes unit who owed her a favour and was willing to make an informal query.
Strand's calendar showed a lunch meeting on the day the audit was closed. The meeting was listed as "external advisory — private." No attendee names.
Lena sent the information to her paper notes, added it to the chain, and looked at what she had.
It was enough to bring in Strand for questioning. It was not yet enough to establish conspiracy to commit murder, which was what she was actually building toward.
She needed the mechanism — the plan B the informant had mentioned, the one that was cleaner and more deniable than the 7:10.
She called the anonymous number back from a payphone two blocks from the precinct. She hadn't used a payphone in years; there were still a few left in the older districts, relics of a previous infrastructure.
It rang four times and then the filtered voice answered. *"You found Strand."*
"I found Strand," she confirmed. "I need the mechanism."
*"You need to look at Krauss's health records."*
She blinked. "Why?"
*"Two weeks ago he had a routine physical at a clinic in Meridian district. Standard bloodwork. The results came back clean, which is correct — he's healthy. But the blood that was taken is still in the clinic's biobank." A pause. "Someone with access to that sample could introduce something that wouldn't show on a standard tox screen. Post-mortem. It would read as a cardiac event."*
The coldness that went through her was professional, not personal. She added it to the list of things she told herself in order to function. "Do you have access to the clinic's records?"
*"I have access to a great many things, Detective Park. The question is whether you can move on the clinic before tomorrow."*
"Why tomorrow?"
*"Because tomorrow is day six."*
She stood in the phone booth in the October afternoon and counted what she had: financial thread, Strand, the mechanism, and one day.
She also had a decision to make about Marco.
The informant, on five separate communications, had never once confirmed that Marco was a threat. They had only said that Lena should be careful who she told. Which was advice she would have given herself, in this situation. Which meant it might have come from someone who knew how she thought.
She dialled Marco's number.
It rang once.
She hung up.
She stood there for a count of ten and thought about what she knew versus what she feared, and about the difference between those two things, which she had always considered to be the essential discipline of her work.
She dialled again.
"I need to tell you something," she said, when he answered. "And I need you to hear it the way I mean it, not the way it might sound."
A pause on his end. "Okay," he said.
"I think there's a complication in the Krauss case," she said. "And I think someone has been trying to make me question whether I should tell you."
Another pause. "And have they succeeded?"
She thought about four years.
"No," she said. "Meet me at the Meridian clinic. I'll explain on the way."
She hung up and walked back toward her car, and thought about the informant — whoever they were, whatever they knew, however they'd gotten her number — and the fact that they had, in the end, pushed her toward the right question: not *who can I trust*, but *what do I know*.
What she knew was that the clinic had a biobank, that there was a plan B, and that she had sixteen hours.
