Jacques Weber

In Paris, police search for a psychopath whose murders are inspired by Jeanne Deber, known as "The Mantis", a famous serial killer who terrorised the country 20 years ago. Believing it takes one to know one, the police asks Jeanne Deber to help hunt the copycat. Placed in solitary confinement since her arrest, "The Mantis" agrees on one condition: to deal only with Detective Damien Carrot, her estranged son. Damien has no choice, for a serial killer is on the loose and could strike anytime, anywhere in Paris.

A head-strong, tough on the outside female detective in Nice works with her 2 colleagues to solve what appears to be a work of serial killer. The investigation leads to a partnership with a psychiatrist who works at a mental institution nearby, and the two work, inspite of one another's dislike for each other, to try and bring a "mythological serial killer" to justice. This is only the visible plot. This strange series of events, not only gets stranger as the days go on, but closer to home for all persons involved. Why, who, and how can all of this be happening with not a shred of evidence?