Both detectives on a sickening murder case struggle with being alone and childless in their 40s. As they investigate the young man found beaten and strangled to death, platonic friends Karine and Herve unravel a love story between Vincent, and Rebecca a high school girl. The teenage lovers quickly plunged into the kind of amour fou the flics fear to chance for themselves. Rebecca is missing, and unknown to her, the boy was a homosexual Internet hustler. The ordinarily blasé male investigator is appalled to find that on-line dating is a world the sexy Karine knows well.