A gritty, compelling thriller in the vein of Gabrielle Lord and Minette Walters.

A doctor is gunned down outside her clinic. A young woman is seen running from the scene, but by the time the police arrive all that's left is her gun.

Detectives Paul Harrigan and Grace Riordan are plunged into a high-profile investigation. There's little to go on until they receive a tip-off about a web site created by the killer. Logging on, they enter a world of bloody retribution - the work of an unstable mind.