[JOAN WATSON]
The brownstone was quiet at 2 AM.
Joan sat at the kitchen table, laptop open, the glow from the screen the only light in the room. Tabs filled her browser — background checks, professional registrations, social media archaeology. All of it focused on one name.
Cash Dalton.
She'd started this investigation three weeks ago, the night after Sherlock's confrontation with Cash in the living room. She'd watched that exchange from the doorway — watched Sherlock's hands shake, watched Cash navigate questions that should have destroyed him, watched something impossible happen: Sherlock choosing to trust someone connected to Jamie's name.
That choice bothered her.
Not because Sherlock was wrong to trust — Joan had learned to respect his instincts about people, even when she didn't understand them. But because Cash's answers hadn't explained anything. He'd admitted to using Jamie's name, to making deals to survive, to hiding things from Sherlock. And Sherlock had accepted that.
Joan couldn't accept it. Not without understanding more.
---
The research had started simple: professional registrations for Cash Dalton, security consultant. Everything was in order — licenses, certifications, client references. Too much in order, actually. The documentation was perfect in a way that real careers rarely were.
She'd moved on to personal history. Birth records, education, employment. Cash Dalton had graduated from a state university with a degree in criminal justice. He'd worked for two private security firms before going independent. His credit history was unremarkable. His social media presence was minimal but appropriate.
All of it checked out. None of it felt true.
Joan had spent years as a sober companion, learning to read people whose entire lives were built on deception. Addicts lied constantly — to themselves, to their families, to everyone who tried to help them. She'd developed an instinct for manufactured authenticity, for stories that were too clean, for histories that didn't have the right texture.
Cash Dalton's background had that texture problem. Everything connected too neatly. Every piece of evidence supported the same story. Real lives were messier — gaps in employment, unexplained moves, relationships that ended badly and left traces.
Cash's life had no gaps. No mess. No traces.
That meant someone had built it.
---
She heard Sherlock's footsteps on the stairs — insomniac as usual, probably heading for the kitchen. Joan closed her laptop quickly, reaching for the cup of cold tea beside it as if she'd simply been unable to sleep.
Too quickly. She saw him notice.
"Working late?" Sherlock paused in the doorway, his expression carrying that particular awareness she'd learned to recognize. He saw the closed laptop. He registered her defensive posture. He filed it away without commenting.
"Couldn't sleep," she said. "Reviewing case notes."
"Ah." He moved to the refrigerator, pulling out a container of leftovers. "The Meridian follow-up?"
"Something like that."
They talked about the case for ten minutes — details Joan already knew, analysis Sherlock had already shared. The conversation was normal on the surface, but underneath, she felt him probing. Wondering what she'd been doing. Deciding whether to ask.
He didn't ask.
"I'll be in the study if you need me," he said eventually, carrying his food upstairs.
Joan waited until his footsteps faded. Then she reopened the laptop.
---
She'd been building a file.
Not like Sherlock's anomaly document — she wasn't tracking impossible knowledge or timeline reconstructions. She was tracking origins. Trying to answer a simpler question than her partner: not what does Cash know, but who is Cash really?
The file contained everything she'd found that didn't fit. A photograph of Cash at a gallery opening that predated his supposed move to New York by three months. A reference from an employer who, when she'd called, seemed uncertain about the details of Cash's work there. A gap in utility records — the kind of gap that suggested someone had lived somewhere without leaving a paper trail.
None of it was conclusive. None of it proved anything. But together, it painted a picture of someone whose history had been constructed rather than lived.
She stared at Cash's photo on the screen — the face of someone she couldn't quite categorize. He seemed genuine when he worked with Sherlock. His grief over losing Marcus had been real. His loyalty to that strange cat of his was undeniable.
But underneath all of that, something was off. Something that didn't connect to the documented history of Cash Dalton, security consultant.
Joan saved her file and opened a new search window. She'd been focusing on the official records — the paper trail that Cash's manufactured identity relied upon. Maybe it was time to look elsewhere.
Who had Cash Dalton been before he became Cash Dalton?
The question kept her awake until dawn.
---
By 6 AM, she had a new lead.
Deep in a forum for former employees of a now-defunct private security firm — one of the companies Cash had supposedly worked for — she found a thread from three years ago. Someone asking if anyone remembered a "Cash Dalton" who'd been hired around a certain date.
The responses were confusing. Some people vaguely remembered someone by that description. Others insisted no one by that name had ever worked there. The dates didn't match up. The job descriptions contradicted each other.
It was exactly the kind of inconsistency that a manufactured background would create if the manufacturer didn't have perfect information about the company they were using as a reference.
Joan bookmarked the thread and closed her laptop.
She'd found something. She didn't know what it meant yet, but she'd found something.
Sherlock was investigating what Cash knew. Joan was investigating who Cash was. Neither had found answers yet.
But she wouldn't stop until she did.
---
Later that morning, Cash arrived at the brownstone for a case consultation. Joan watched him from the kitchen doorway — the easy way he moved through their space, the rapport he'd built with Sherlock, the careful charm he deployed when speaking with her.
He caught her watching and smiled. "Morning, Dr. Watson."
"Mr. Dalton."
She smiled back, pleasant and professional, revealing nothing of the file on her laptop or the questions that kept her awake at night.
Two investigations. One target.
And Cash Dalton had no idea that the second one existed.
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