Chapter 11 : The Radius
Brixton Bedsit — July 30, 2010, 2:00 AM
The A-Z was covered in red ink.
I'd been at it for six hours. The bedsit table — barely wide enough for the open atlas and my notebook — was littered with scrap paper, distance calculations, travel time estimates scrawled in the margins. Mrs. Okonkwo's television had gone silent hours ago. The only sound was the scratch of my pen and the distant bass thump of a car stereo somewhere on Railton Road.
Geographic profiling wasn't magic. It was mathematics applied to behaviour. The principle was simple: serial offenders operate from anchor points — home, workplace, familiar territory. The locations of their crimes form a pattern around that anchor. Map enough crime sites, calculate the distances, identify the overlapping zones, and you narrow the search area from an entire city to a handful of streets.
I'd learned the technique at Quantico, in a seminar taught by a Canadian criminologist who'd developed the software that half the major police forces in the world now used. I didn't have the software. But I had the methodology, and I had four data points.
Patterson: Hotel in Docklands. East London. Phillimore: Park-and-ride in Croydon. South London. Davenport: Construction site in Waterloo. Central-South London. Wilson: Empty house in Brixton. South London.
I drew the circles — radial distances from each location, calculated at average London traffic speeds during the times of death. The overlap zones were broad at first, but when I weighted for time-of-day travel patterns — evening and night, when traffic thinned — the zones tightened.
The largest overlap area covered a band running from Lambeth through Southwark to Bermondsey. South of the river. Central-adjacent. The kind of area where a cab driver who worked cross-London routes might live.
Not a bus driver — buses follow fixed routes that would constrain victim selection to specific corridors.
Not a Tube driver — Underground staff work scheduled shifts with recorded movements.
Not a minicab — too easily traced through booking systems.
A black cab. A licensed hackney carriage. Anonymous, self-directed, invisible.
London had approximately 21,000 licensed black cab drivers. The geographic profile narrowed it to a residential zone covering maybe two thousand of them. Still too many. I needed another filter.
Motive.
Why would a cabbie kill strangers? Money? Some cabbies earned well, but most didn't earn killing-well. Ideology? Nothing connected the victims politically or religiously. Personal vendetta? The victims had nothing in common.
Which left one option that made everything fit: the killer had nothing left to lose. Terminal illness. Someone who was going to die anyway and had found a way to make his remaining time profitable — or meaningful, in whatever twisted sense that word held for him.
Cross-reference: cab drivers with terminal diagnoses.
Except I couldn't. Medical records were sealed behind privacy laws that no amount of social engineering could bypass. I didn't have police authority, NHS contacts, or hacking skills. I had a red pen and an A-Z atlas.
Think differently, Cole.
I put the pen down. Rubbed my eyes. The clock on the wall — a cheap plastic thing from Poundland — showed 2:47 AM. I'd been doing this for nearly seven hours, and I was hitting the wall that all analysts hit eventually: the gap between theory and evidence.
[Mental Stamina: Low. Extended analytical session. Rest recommended.]
I pushed through it anyway. Not because the system told me to rest, but because Jennifer Wilson had been dead for less than thirty-six hours and the man who killed her was still operating.
What can a civilian access?
Public records. News archives. Social media. Companies House. The electoral register. Taxi licensing information from Transport for London — which, crucially, was partially public. Licensed cab drivers had badge numbers. Badge numbers linked to registered addresses. If I could identify drivers registered in the overlap zone...
Still thousands. Need another filter.
I stared at the map. The circles. The overlap.
And then I saw it.
The death locations weren't random within the cabbie's operational area. They were specific. Isolated. Private. Each one was a place where someone could die without being found for hours — a hotel room, a parked car, a construction site, an empty house. The killer knew these locations in advance. He'd scouted them.
Which meant he'd driven to them before. During his normal working hours. The cabbie was using his job to identify kill sites — driving past empty buildings, noting construction sites, memorising isolated car parks. The job and the murders were inseparable.
[Deduction: Kill site selection method identified. Cabbie uses work routes for reconnaissance.]
[DED +1. New total: 14]
I can narrow this. A driver who works South London routes, lives in the Lambeth-Southwark corridor, and has been operating for years — long enough to know the geography intimately.
It wasn't a name. It wasn't enough for the police. But it was a profile, and profiles were what caught killers.
---
Brixton Bedsit — July 31, 2010, 4:30 PM
I slept for four hours, ran for thirty minutes — my body protesting every step, knees aching in a way they hadn't a month ago — and spent the morning at the library running TfL licensing searches on the public terminals.
The licensing database was limited. It confirmed that approximately two thousand eight hundred drivers had registered addresses in the boroughs of Lambeth, Southwark, and Bermondsey. No medical records. No criminal histories. No ages, even. Just badge numbers and registration dates.
Useless in volume. Useful as a denominator.
I was cross-referencing registration dates — looking for drivers with twenty-plus years of experience, the kind of deep geographic knowledge the kill-site selection required — when my burner phone rang.
Charlie.
"Nathan. You watching the news?"
"I'm at the library. What is it?"
"That detective bloke. Holmes. He showed up at Lauriston Gardens yesterday. Made the police look like children. Rosa heard from her contact at the Standard — they're calling him a 'consulting detective.' He's telling them the suicides are murders."
My hand tightened on the phone. The library's silence pressed in — the rustle of turning pages, the click of keyboards, the hum of fluorescent lights overhead.
Sherlock's in.
"What exactly did he do?" I asked, keeping my voice level.
"Walked right under the tape, apparently. Spent twenty minutes with the body, told the Detective Inspector things nobody else could see. Something about the woman's coat and her wedding ring. Rosa's contact was vague on details."
The pink coat. Jennifer Wilson's pink phone, pink case, pink shoes. "A Study in Pink." It's happening.
[Alert: Case competition detected. Rival investigator: S. Holmes. Status: Active.]
I thanked Charlie and hung up.
The library's internet terminals were slow — institutional broadband that moved with the urgency of a civil servant on a Friday afternoon — but I found the news article. Evening Standard online edition.
"SERIAL SUICIDES" LINKED: AMATEUR SLEUTH ASSISTS POLICE
The photograph was blurry, taken from behind the police tape. A tall figure in a dark coat, collar turned up, moving with the angular energy of someone who found standing still physically painful. Next to him, barely visible: a shorter figure, steadier, watching.
Sherlock Holmes and John Watson.
The article was thin on specifics — "a consulting detective working with Scotland Yard" was doing more than the police wanted to admit publicly. No details of his deductions. No mention of a taxi.
I stared at the photograph for a long time.
He's real. Of course he's real — I've known that since April. But seeing him...
He was taller than the screen had made him. Even in a grainy newspaper photo, something about his posture communicated an intelligence that bordered on aggressive — the way he stood, the angle of his head, the hands that seemed to be in constant motion.
And there was John. The man who would shoot a cabbie through a window to save a stranger he'd known for forty-eight hours. The man whose steady presence would keep Sherlock Holmes human, or as close to human as Sherlock could manage.
Something stirred in my chest. Not quite jealousy. Not quite admiration. Something closer to competitive urgency — the knowledge that the smartest person in London was now working the same case, and he had everything I didn't: police access, forensic expertise, a mind that operated at processing speeds I could only approximate with hard work and a system that gave me incremental advantages.
You're not going to beat him to the answer. You know that. He'll solve the cabbie case — that's canon, that's how the story goes.
But you can contribute something he misses. You can prove that Nathan Cole is a factor, not a footnote.
[+10 SP. Competitive analysis: rival assessment complete.]
I logged off the terminal, gathered my notes, and walked home through streets that looked the same as they always did — buses, pedestrians, the Brixton Market crowd spilling onto the pavement. Nothing in this city cared that two separate investigations were converging on the same killer from different directions.
At the bedsit, I stood before the corkboard. The map. The circles. The profile.
I picked up a marker and wrote two words in the center of the overlap zone, circled them twice:
TAXI DRIVER.
Underneath, smaller:
South London. 20+ years licensed. Terminal illness. Knows isolated locations.
It was a profile. Not a name. But it was mine — built from observation, analysis, and the kind of patient ground-level work that Sherlock Holmes would never lower himself to do.
The question was what to do with it.
Want more? The story continues on Patreon!
If you can't wait for the weekly release, you can grab +10, +15, or +20 chapters ahead of time on my Patreon page. Your support helps me keep this System running!
Read ahead here: [ patreon.com/system_enjoyer ]