London, April 1891. When the severed torso of a woman washes up on the bank of the river Thames, London believes a serial killer from the past has struck again. Crime photographer and investigator Sarah Bain Barrett is on the scene with her friends Mick O’Reilly and Lord Hugh Staunton. This is their chance to solve a grisly cold case and deliver a monster to belated justice, with help from Sarah’s husband Detective Sergeant Thomas Barrett; her sister Sally Albert, an intrepid newspaper reporter; and Hugh’s psychologist, Dr. Joshua Lewes, who’s a pioneer in the new science of criminal profiling. 

But the opportunity brings troubles galore. Sarah and her husband can’t agree on what direction their inquiries should take, and their discord threatens not only the investigation but also their marriage. To complicate matters, Sarah’s bitter enemy, Inspector Reid, is leading the police’s hunt for the killer they’re calling the Torso Murderer. Obsessed with the Ripper case and his own failure to solve it, he thinks the Ripper and the Torso Murderer are one and the same person—a notion that could steer the police investigation disastrously off course. 

Hot in pursuit of the killer, Reid is also hell-bent on discovering what Sarah and company have been hiding about the Ripper. The Torso Murder case threatens to expose a dangerous truth, tear apart Sarah’s close-knit band of comrades, and send them to the gallows before they can put the killer out of action.