Colton Driscoll is a compulsive liar. But his psychologist Sam Reeves fears he is telling the truth about one thing: murder. Worried Colton has committed an awful crime and that another girl could be in danger Sam calls in an anonymous tip to the police. Detective Kit McKittrick works homicide in the hope that one day she will find out what happened to her foster sister Wren. When a tip from an anonymous caller leads her to the body of a girl whose murder has the hallmarks of a serial killer at large for almost 20 years it also leads her to the information's source: Dr Sam Reeves. Will Kit be able to crack the cold case in time to stop another murder being committed? And is Sam just a concerned citizen or is there another more sinister reason he has so much information?