Jack the Ripper is often called the world’s most notorious unidentified killer, but he was not the first modern serial killer on the streets of London. Before him was another murderer who hunted from the River Thames – one arguably more sadistic and mercurial. The Thames Torso Killer has always lurked in the Ripper’s shadow, despite the fact he murdered and dismembered at least four women over two years in an overlapping period of time. He deposited his victims’ body parts at diverse locations including the tidal River Thames, and his crimes were named after the places where the torsos or first body parts were found: Rainham in Essex, Whitehall, Battersea and Pinchin Street in Whitechapel. In this talk, Sarah Bax Horton—author of Arm of Eve: Investigating the Thames Torso Murders—describes her investigation and use of modern criminal profiling to come up with her own suspect: river worker James Crick.