A #1 New York Times Bestseller A Publishers Weekly Bestseller A US Today Bestseller

Imagine a killer who thinks: "What is the worst thing that anyone has ever done?" - and then goes far beyond. Now imagine four career women banding together to track down the demented murderer, who preys on San Francisco newlyweds. In this thrilling series debut, the four women - a police detective, an assistant D.A., a reporter, and a medical examiner - develop intense friendships even as they pursue a killer whose twisted imagination has stunned an entire city. Working together, they have the mettle to follow the leads to an impossibly heart-stopping confrontation with the most terrifying serial killer ever imagined.