Imagine Christmas in Paris and an uneasy feeling that something is very wrong in the case you are investigating. Chief of Police Nico Sirsky returns to work after recovering from a gunshot wound. He's in love and rearing to go. His first day back has him overseeing a jewel heist sting and taking on an odd investigation. Dental students discovered a message in the tooth of a severed head. Is it a sick joke? Sirsky and his team of crack homicide detectives follow the clues from an apparent suicide, to an apparent accident, to an all-out murder as an intricate machination starts breaking down. Just how far can despair push a man? How clear is the line between good and evil?