Amy is cursed by her psychotic impulse to count every good or bad thing that happens in her life. When she reaches her decisive bad count of ten, there's a real danger that her alter-ego, Jessica, will make someone suffer. The local police force is in a state of flux. Detective Sergeants Holmes and Chappell are thrown together to solve a murder. One inspirational, one meticulous, they are presented with a body more than a week old, limited and contradictory forensic evidence, and no obvious suspect. Having missed the critical first forty-eight hours of opportunity, the detectives have an uphill struggle if they are to solve a brutal and callous crime and achieve a successful arrest and conviction. The perpetrator has methodically cleansed the crime scene and dispassionately disposed of the evidence. Can she continue to avoid detection? Could she possibly strike again?
