Dr. Sylvia Strange - forensic psychiatrist and expert on criminal sexuality - returns in a thrilling new suspense novel and comes head-to-head with a terrifying serial killer whose weapon of choice is a poison nearly impossible to trace and, when ingested, nearly impossible to counteract.

A baffling series of deaths have occurred over the span of a decade in some of the most prestigious research laboratories around the world. Now Dr. Sylvia Strange, forensic expert, and criminal profiler Edmund Sweetheart, FBI consultant, are called in to investigate what is looking like murder.

Their prime suspect is Dr. Christine Palmer, a brilliant scientist whose work with scientific think tanks around the world made her one of three scientists knowledgeable about exotic neurotoxins and their antidotes. What follows is a taut and terrifying investigation, in which Sylvia finds herself able to trust no one - but herself.