The Cerbère Squad, at the controls of Captain Pelletier, is entrusted with the file of an arson attack that has occurred in a furniture store. Now at the Anti-Gang Squad, Lily-Rose begins a new investigation at the scene of a shooting alongside her new and colorful sidekick Cindy Castonguay. Quickly, the investigators of the two departments will see the need to share important information to advance their respective investigations.