In the wake of 9/11, Paris is living in a state of heightened fear. For Aimee 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 Aimee's friend Michou, is found unconscious at the scene of the crime, his fingerprints on the bomb fragments. Aimee doesn't believe Boris set the bomb. In an effort to prove him not guilty, she battles the police and his own lab colleagues, collecting conflicting eyewitness reports. When a member of the French secret service drafts Aimee to help investigate possible links to an Iranian Revolutionary guard and fugitive radicals who bombed Interpol in the 1980s, Aimee uncovers ties to a cold case of her father's.