[JOAN WATSON]
The brownstone was quiet at midnight when Joan opened her laptop.
She'd been building this file for weeks now — a parallel investigation that Sherlock didn't know about, focused on a question he hadn't thought to ask. He was tracking Cash Dalton's anomalies, his impossible knowledge, the patterns that suggested foreknowledge of events he shouldn't have been able to predict.
Joan was asking something simpler: who was Cash Dalton before he became Cash Dalton?
The answer, increasingly, was no one.
She'd traced his professional certifications — all legitimate, all properly filed, all dating back exactly three months. Before that, nothing. No work history, no educational records, no social media presence, no trace of a person who should have had decades of existence.
The references he'd provided checked out when you called them. But when Joan dug deeper — visiting offices in person, speaking to colleagues of the people who'd supposedly vouched for him — the story fell apart. No one actually remembered working with Cash Dalton. The recommendations existed on paper but not in people's memories.
His background wasn't just incomplete. It was manufactured.
---
She spread her findings across the kitchen table, organizing them into categories.
Documentation: Expert-level forgery. The documents themselves were real — legitimate paper, proper seals, accurate filing procedures. Someone with significant resources had created Cash Dalton's identity from scratch.
Timeline: Three months. Everything about Cash Dalton began approximately ninety days before he first appeared on their radar. Before that, he was a ghost.
Behavior: He knew things he shouldn't know. Sherlock had documented dozens of instances — knowledge about people's pasts, predictions about events that hadn't happened yet, an uncanny ability to be in the right place at the right time.
Motivation: Unknown. Cash didn't seem malicious. He helped people. He worked with Sherlock productively. He'd asked for help on a case just last week, showing vulnerability that manipulators rarely displayed.
But none of that explained who he really was.
Joan stared at the photograph she'd printed — Cash at the brownstone during a recent consultation, his expression focused and engaged. He looked like exactly what he claimed to be: a security consultant with unusual connections and useful skills.
He looked real.
But everything underneath was fabricated.
---
Sherlock found her at 2 AM.
He appeared in the kitchen doorway, wearing the particular expression of someone who'd noticed something he couldn't ignore. His eyes moved across the table — the documents, the photographs, the organized evidence of weeks of investigation.
"You've been researching Cash Dalton," he said.
"Yes."
"Without telling me."
"I wanted to be sure before I shared." Joan closed her laptop but didn't try to hide the physical files. "You were focused on what he knows. I was focused on who he is. They're related questions, but they required different approaches."
Sherlock walked to the table and began examining her materials, his mind processing information with the speed that still occasionally startled her after years of partnership.
"His background is fabricated," he said after a minute.
"Completely. The documentation is expert-level work — I couldn't find flaws in the paperwork itself. But the people who supposedly know him don't actually remember him. The jobs he supposedly worked don't have records of his employment. Everything about Cash Dalton begins three months ago."
"Interesting." Sherlock pulled out a chair and sat, his attention fully engaged now. "That aligns with my anomaly tracking. His impossible knowledge has a similar timeline — he appears to know things that happened after his supposed arrival in New York, but his predictions about events further in the future are less reliable."
"What does that mean?"
"I don't know yet." Sherlock steepled his fingers in that characteristic pose. "Let me show you what I've documented."
He retrieved his own file from the study — the folder labeled "Cash Dalton: Anomalies" that Joan had glimpsed during her midnight research sessions. Inside were timeline reconstructions, correlation analyses, pattern mappings. Months of observation reduced to evidence that pointed at something impossible.
"He knew about my beekeeping plans," Sherlock said, spreading documents across the table. "Information I hadn't shared with anyone except you. He knew about Jamie before he should have — recognized implications that required knowledge of her methods, her history, her psychology. He predicted case outcomes before investigations concluded, positioned himself at crime scenes before crimes occurred, demonstrated understanding of people's motivations that would require intimate knowledge of their pasts."
"Foreknowledge," Joan said.
"That's what the evidence suggests. But foreknowledge of what? And how?"
They sat in silence for a moment, two investigators staring at evidence that pointed at something neither could explain.
"He's not malicious," Joan said finally. "I've watched him carefully. He helps people. He asked you for help on the Reeves case — showed genuine vulnerability. That's not the behavior of someone trying to manipulate us."
"No, it's not." Sherlock picked up one of the photographs. "He's hiding something enormous. Something that would explain both the fabricated background and the impossible knowledge. But whatever he's hiding, I don't believe it's hostile intent."
"Then what do we do?"
The question hung between them. They'd spent weeks — months, in Sherlock's case — building evidence that their partner was something other than what he claimed. The logical conclusion was confrontation: present the evidence, demand explanations, resolve the uncertainty.
But Joan remembered Cash's face during the Reeves case consultation. The genuine frustration when his investigation had gone wrong. The willingness to admit failure and ask for help. The growth she'd witnessed when he'd solved the case through actual skill rather than whatever mysterious advantage he usually relied on.
He was hiding something. But he was also trying to be good.
"We keep watching," Sherlock said, answering her question. "We continue the partnership — he's useful, possibly genuinely aligned with our goals. But we watch more carefully. Document more thoroughly. And eventually, when we have enough information..."
"We confront him."
"Yes." Sherlock began organizing their combined files into a single folder. "But not yet. Not until we understand enough to ask the right questions."
---
They worked until dawn, combining their investigations into a single comprehensive dossier.
Joan's background research sat alongside Sherlock's anomaly tracking. The fabricated identity beside the impossible knowledge. Two threads that wove together into a portrait of someone who shouldn't exist — someone who had appeared from nowhere with documentation that was manufactured and information that was inexplicable.
"What's your theory?" Joan asked as the first light began filtering through the brownstone windows.
"I don't have one that fits all the evidence." Sherlock closed the folder. "Time travel would explain the foreknowledge but not the fabricated background. Deep-cover intelligence operative would explain the background but not the supernatural precision of his predictions. Elaborate con artist would explain the manipulation but not the genuine emotion I've observed."
"What about something we haven't considered?"
"There's always something we haven't considered. That's why we keep investigating."
Joan thought about all the impossible things she'd witnessed since becoming Sherlock's partner. Cases that defied explanation. Criminals with capabilities that seemed superhuman. The boundaries of possibility stretched further than she'd imagined before entering this world.
Maybe Cash Dalton was something beyond those boundaries. Something that required new categories of understanding.
"He asked for help on the Reeves case," she said. "He admitted he was wrong. He let you see him fail."
"Yes."
"That's not something someone trying to maintain a deception would do. It's too vulnerable. Too real."
"Unless the vulnerability itself is part of the manipulation." Sherlock stood, stretching muscles stiff from hours of sitting. "But I don't believe that's the case. I think Cash Dalton — whoever he really is — is genuinely trying to be something better than his circumstances require."
"Then we give him room to be that person."
"While watching. Always watching."
Joan nodded. It wasn't a perfect solution — the uncertainty would continue, the questions would remain unanswered, the mystery would hang over every interaction. But it was better than the alternatives: confronting prematurely and destroying a partnership that was genuinely useful, or ignoring evidence and being blindsided by whatever Cash was hiding.
They would watch. They would document. They would wait.
And when the time came — when they finally had enough information to ask the right questions — they would learn who Cash Dalton really was.
---
Later that morning, Cash arrived at the brownstone for a routine consultation.
Joan watched him from the kitchen doorway as he greeted Sherlock, falling into the easy rhythm of professional collaboration. He looked the same as always — capable, competent, carrying secrets behind eyes that showed genuine warmth.
He had no idea that two separate investigations had just combined into one. No idea that every word he spoke, every reaction he displayed, every piece of information he revealed was being catalogued and analyzed.
He was walking through a trap he couldn't see.
Joan almost felt sorry for him. Almost.
But she remembered the fabricated background, the impossible knowledge, the mystery that had consumed weeks of her nights. Whatever Cash Dalton was hiding, it was significant enough to justify the deception. Significant enough to require constant vigilance.
She smiled pleasantly as he passed, offering coffee, asking about his recent case. The mask of normalcy that covered an investigation he couldn't suspect.
Some questions answered themselves badly when pressed too hard.
But eventually, all questions demanded answers.
Joan returned to the kitchen, poured coffee for three, and waited for the moment when the truth would finally emerge.
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