In the heat of a French summer, Captain Paul Darac of the Nice Brigade Criminelle is called to a highly sensitive crime scene. A man has been found murdered in the midst of a Muslim prayer group, but no one saw how it was done. Then the organisers of the Nice leg of the Tour de France receive an unlikely terrorist threat. In what becomes a frantic race against time, Darac must try and unpick a complex knot in which racial hatred, sex and revenge are tightly intertwined.