This book is a kick-ass FBI book with two female leads! Ella is the main POV, obsessed with serial killers, and is basically an encyclopedia of everything serial killer. She is given the opportunity of her lifetime, to work with the Behavioural Crimes Unit, to hunt down a serial killer, mimicking all serial killers. This book kept me interested from start to finish, Ella and Ripley are enjoyable characters and very keen to get started on the next book!