Lana Delaunay, the owner of Le Cibourg restaurant in Bidart, is transforming a second restaurant into a tapas bar in the region. She had to entrust the management of this new place to one of her waitresses, Magali Lenoir, 23 years old. Only, the latter is found dead in the premises by a mason. Captain Marleau is in charge of the investigation. She soon discovers that Lana Delaunay lost her 18-month-old son, Nathan, last spring, hit by a driver who fled. Since then, the mother has been considering rebuilding her life elsewhere.