Léa Dubois has been dead for three days when her body and her bicycle are found hidden under tree leaves near a river close to Issanka Park. The coroner reports she was run over by a car, raped and hit with a stone until her death. The killer cut off a lock of the victim's hair, a modus operandi which reminds Candice of Simon Belvaux's, a serial killer sent to prison when she worked in Paris. While the team is investigating similar cases, Candice travels to Paris to meet Pascal Louvier, her former partner in the brigade, which lead them to remember the old times.
—mgallegog