Kat and Lock

Kat Frank knows all about loss. A widowed single mother, Kat is a cop who trusts her intuition. Picked to lead a pilot program that has her paired with Lock, an AIDE (Artificially Intelligent Detective Entity)—a hologram that is activated by a device on Kat’s wrist—Kat’s gut reactions about people and motives come up against Lock’s statistical calculations and data analysis that can be devised in seconds. But as the two missing person’s cold cases they are reviewing suddenly become active, Lock is the only one who can help when the case begins to target Kat personally.

DCS Kat Frank knows all about loss. A widowed single mother, Kat is a cop who trusts her instincts. Picked to lead a pilot programme that has her paired with AIDE (Artificial Intelligence Detective Entity) Lock, Kat's instincts come up against Lock's logic. But when the two missing person's cold cases they are reviewing suddenly become active, Lock is the only one who can help Kat when the case gets personal. AI versus human experience. Logic versus instinct. With lives on the line can the pair work together before someone else becomes another statistic?

When the body of a man is found crucified at the top of a hill in the British midlands, AIDE Lock—the world’s first AI Detective—and Detective Kat Frank are thrust into the spotlight as they are given their first live case. When a second body is found the police issue an extraordinary warning to local males aged between 30 and 40 years old. With the national media and local men in an uproar, Kat and Lock have to combine their instincts and algorithms to catch the killer before they can strike again.

When the body of a man is found crucified at the top of Mount Judd, DCS Kat Frank and her partner, AIDE (Artificially Intelligent Detecting Entity) Lock, of the Warwickshire Future Policing Unit, have their work cut out for them. Previously only dealing with cold cases, the FPU are thrust into the spotlight as another body is found – also crucified – and it appears as though there is a serial killer on the loose. But why these victims? And who will be next?

Pre-order BODY OF LIES, the brand-new thriller featuring DCS Kat Frank and AIDE Lock from the award-winning and Sunday Times bestselling author Jo Callaghan, coming Spring 2026. From the author of In the Blink of an Eye, the Sunday Times bestseller, winner of the CWA ILP John Creasey (New...