November 2001: in the wake of 9/11, Paris is living in a state of fear. For Aimée Leduc, November is bittersweet: the anniversary of her father’s death and her daughter’s third birthday fall on the same day. A gathering for family and friends is disrupted when a bomb goes off at the police laboratory, and Boris Viard, the partner of Aimée’s friend Michou, is found unconscious at the scene of the crime with traces of explosives under his fingernails.