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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 25 years ago. Jeanne Deber offers her expertise to the police in order to help hunt the copycat. Placed in solitary confinement since her arrest, "The Mantis" has 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.