From the butchery of Jack the Ripper to the organised crime of the Krays, an ambitious project is under way to map every London murder case since the 19th Century.
Murder Map's founders Nick Cullen, 27, and Peter Stubley, 33, are plotting this macabre visualisation, which could prove gruesome and grossly insensitive to some, but fascinating and potentially useful to others.
Here's my BBC News feature.
