Murder in Montmartre

Parisian P. I. Aimée Leduc strives to clear the name of a childhood friend, now a policewoman, who's charged with shooting her partnerAimée Leduc is having a bad day. First, she comes home from work at her Paris detective agency to learn that her boyfriend is leaving her. She goes out for a drink with her friend Laure, a police officer, but Laure's patrol partner, Jacques, interrupts, saying he needs to talk to Laure urgently.
The two leave the bar, and when they don't return, Aimée follows Laure's path and finds her sprawled on a snowy rooftop, not far from Jacques, who is bleeding from a fatal gunshot wound. When the police arrive, they arrest Laure for murder. No one is interested in helping Aimée figure out the truth. As she chases down increasingly dangerous leads in the effort to free her friend, Aimée stumbles into a web of Corsican nationalists, separatists, gangsters, and artists.
Could Jacques's murder and Laure's arrest be part of a much bigger cover-up?