A young artist called Cyrille Solano has been murdered in his apartment.The commander Sorensen has an intuition: this case remembers him a serial killer called "Lonely heart" who let always the same clue.The autopsy confirms the intuition: the victim had a rosebud in his bandaged mouth and was killed by a hit on the head.The serial killer hasn't been identified and disappeared 8 years ago.The commander Sorensen proposes to look for the help of a professional profiler, Justine Nizan who helped the French police in some difficult cases.
—zutterjp48