Emma Thélier, a police captain, is on holiday in Charente-Maritime at her mother's house, when, while jogging, she comes across a murdered man. Emma, who knows the region well, is entrusted with the investigation in the company of gendarmerie captain Adrien Klévec, with whom she spent the previous night. A one-night stand for the two policemen, both as embarrassed as each other to find themselves in pairs. They decide to pretend that nothing has happened between them and begin the investigation to find out who shot this man with a silver bullet. Emma prefers the field and action, Adrien, the analytical study of files and profiles... Everything opposes them and yet, they cannot hide their mutual attraction. New murders are perpetrated... How far will the investigation take them?