Melac, Aimée Leduc's ex, has been hounding has been hounding her for weeks, pressuring her to move little Chloé to Brittany, threatening to take her to court for custody--all but stalking her. Harassed and fed up, Aimée has stopped taking his calls. That's why she doesn't know as she's leaving a client's office late one night that Melac is waiting for her by the Bassin de la Villette--where an assailant attacks him just in time for Aimee to find his still-bleeding body in the canal. Interrupted, the killer knocks Aimée unconscious and plants the bloody knife in her hands for the police to find.

Now Aimée is in police custody, debilitated by her concussion, with overwhelming evidence working against her. She has to figure out who murdered Melac--not an easy job, given the target on his back as a former homicide investigator. Cut off from her typical network and forced to operate under multiple layers of cover, Aimée must go deep into the underbelly of Paris's 19th arrondissement, where she rubs shoulders with biker gangs, paranoid journalists, grieving parents, and frustratingly tight-lipped ex-cops on her hunt for justice.