Sarah Reeves's sister lived in a brownstone in Park Slope — the kind of neighborhood where murder felt like something that happened to other people. Margaret Chen answered the door with the particular wariness of someone who'd spent weeks being questioned by police and journalists.
"Mr. Dalton?" She'd agreed to the meeting reluctantly, only after Daniel's lawyer had vouched for me. "You're the investigator Daniel hired."
"I'm trying to find what the police missed."
"The police didn't miss anything. They just couldn't prove it." Her voice was flat, controlled. "Daniel killed my sister. Everyone knows it."
"Everyone knows it, but no one can prove it. That's an interesting contradiction."
She studied me for a moment, then stepped aside to let me in.
The living room was comfortable, lived-in, decorated with photographs of two women who looked similar enough to be sisters. Sarah and Margaret at graduations, at weddings, at holiday gatherings. The family resemblance was striking — same dark hair, same sharp features, same particular way of holding their shoulders.
"You were close," I said.
"We were sisters." Margaret sat down heavily in an armchair. "Complicated, like all sisters, but close. She called me the night before she died. We talked about her marriage, her job, the usual things."
"Did she mention any concerns? Anyone she was worried about?"
"Just Daniel." Margaret's expression hardened. "They'd been fighting about money. Sarah wanted to expand her business — she ran a small interior design firm — and Daniel thought it was too risky. They'd been arguing for weeks."
The Memory Palace filed the information, cross-referencing with what I'd read in the police files. The money arguments were documented. Daniel had admitted to them in his interviews. But arguments about money weren't unusual in marriages, and they didn't prove murder.
"What about her business?" I asked. "Any problems there? Difficult clients, disputes with partners?"
"Her business partner is Michael Harrington. They've worked together for eight years. No problems that I know of." Margaret paused. "Why are you asking about the business? Daniel killed her. The business has nothing to do with it."
"I'm asking about everything. That's how investigations work."
"Investigations that are trying to prove the obvious."
"Or discover the truth."
Margaret was silent for a long moment. When she spoke again, her voice had lost some of its edge.
"I don't know why I'm talking to you. You're working for Daniel. You're trying to get him off."
"I'm trying to find out what happened. If Daniel killed Sarah, my investigation will confirm that. If he didn't, my investigation might find who did." I leaned forward slightly. "You want justice for your sister, don't you?"
"I want Daniel to pay for what he did."
"What if he didn't do it?"
The question landed with weight. Margaret's expression flickered — doubt, quickly suppressed, but present nonetheless.
"He did it," she said. But there was less certainty now.
---
The next three days were a blur of interviews.
I spoke to Sarah's business partner, Michael Harrington — a polished man in his fifties who expressed appropriate grief and offered nothing useful. I spoke to neighbors who'd heard the arguments, colleagues who'd noticed tension, friends who'd watched the marriage deteriorate.
Everyone told the same story: Daniel and Sarah had been fighting. The marriage was failing. Daniel had opportunity and motive. The only question was why the police couldn't prove it.
But something nagged at me. A detail that didn't fit, lurking at the edge of my awareness like a half-remembered dream.
"You're bothered," Vex observed on the third night, watching me spread case files across my desk.
"The timeline doesn't work."
"What do you mean?"
"Daniel says he was in the basement doing laundry when Sarah was killed. The police say he can't prove it. But look at this." I pulled out the forensic report. "The attack happened in the kitchen. Multiple strikes, violent struggle, blood spatter on three walls. If Daniel did this, he would have been covered in blood."
"The police theory is that he cleaned up."
"In the time between the murder and calling 911? The timeline gives him maybe fifteen minutes. That's not enough to shower, change clothes, dispose of the bloody items, and clean the bathroom well enough that forensics found nothing."
Vex studied the files. "Unless he planned ahead. Had clean clothes ready, disposed of evidence before calling."
"Then why call at all? Why not claim he came home and found her?" I shook my head. "The behavior doesn't fit. Daniel called 911 in a panic. The recording shows genuine distress. Either he's the best actor in the world, or he really didn't know what had happened until he found her."
"So who did it?"
That was the question I couldn't answer. I'd interviewed everyone in Sarah's life. I'd reviewed every piece of evidence. I'd applied Basic Deduction to every observation, looking for patterns that didn't fit.
And I kept coming back to one name: Michael Harrington.
The business partner. The man who'd worked with Sarah for eight years. The man who'd expressed appropriate grief and offered nothing useful.
Something about him felt wrong. Not obviously wrong — he'd been cooperative, sympathetic, exactly what you'd expect from a colleague mourning a friend. But his cooperation had been too smooth. His answers too polished. The kind of performance you gave when you'd rehearsed.
"Harrington," I said to Vex. "I think it's Harrington."
"Based on what?"
"Instinct. He was too comfortable being questioned. Too prepared." I started gathering files. "I need to look at the business more carefully. If there's a motive there, I'll find it."
"And if you're wrong?"
"Then I keep looking."
---
I spent two days digging into the interior design business.
Financial records. Client lists. Partnership agreements. Everything I could access through public records and some things I accessed through less public channels. The picture that emerged was troubling.
The business was struggling. Revenue had dropped forty percent over the past year. Several major clients had left for competitors. The partnership agreement gave Harrington significant financial exposure if the company failed — exposure that would be eliminated if Sarah died and her share of the business passed to her estate.
"Motive," I told Vex. "If Sarah died, Harrington could potentially buy her share from the estate at a reduced rate. Or restructure the business entirely. Either way, he benefits."
"That's circumstantial."
"It's a start."
I called Daniel's lawyer and shared what I'd found. The lawyer was cautiously optimistic — new avenues of investigation, alternative suspects, the kind of material that could help rebuild Daniel's reputation even if it didn't lead to prosecution.
Then I called Daniel himself.
"Harrington?" His voice was confused, hopeful. "You think Michael killed Sarah?"
"I think he had motive. I'm still building the case."
"I never would have suspected him. He and Sarah were friends. Partners. They'd known each other since before we got married."
"Sometimes that's exactly why people kill."
I hung up feeling confident. The pieces were coming together. Harrington had motive, he'd been too polished in his interview, and the business connection gave him access that the police might have overlooked.
But I should have been more careful. I should have verified more thoroughly. I should have remembered that confidence without confirmation is just arrogance wearing a different mask.
---
The call came the next morning.
"Mr. Dalton?" The voice was female, frightened, speaking barely above a whisper. "This is Lisa Chen. Margaret's daughter. You interviewed my mother last week."
"I remember. What's wrong?"
"Someone came to our house last night. Left a note on the doorstep. It said... it said if we keep talking to investigators, we'll regret it."
Ice crystallized in my stomach.
"Did you call the police?"
"Mom doesn't want to. She's scared. She thinks..." Lisa's voice broke. "She thinks whoever really killed Aunt Sarah knows we've been helping you. And now they're warning us to stop."
The real killer. Not Michael Harrington — the man I'd identified as my prime suspect. Someone else. Someone I'd dismissed, overlooked, eliminated from consideration.
Someone who'd noticed my investigation and decided to send a message.
"Stay inside," I said. "Lock your doors. I'll send someone to watch your house tonight."
"Who?"
"People I trust."
I hung up and stared at the wall of my room, the case files scattered around me like accusations. I'd been wrong. I'd identified the wrong suspect, shared my conclusions with my client, and the real killer had responded by threatening a witness.
My mistake had put someone in danger.
Vex appeared beside me, reading the situation in my expression.
"You were wrong about Harrington."
"Apparently."
"The real killer is someone else. Someone who's been watching your investigation."
"And now they know I'm getting close." I stood up, grabbing my jacket. "I need to protect the Chens. And I need to find out who I missed."
"How?"
"By going back to the beginning and admitting I don't know as much as I thought I did."
I walked out into the Brooklyn morning, carrying the weight of my error like something physical. I'd been so used to knowing — so accustomed to meta-knowledge providing answers before I finished asking questions — that I'd forgotten how dangerous not knowing could be.
Errors in this work cost more than pride.
They cost people's safety.
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