Juliane (Sophie Marceau) is a highly respected police commissioner in Paris known for her firm moral compass and dedication to justice. She lives a seemingly comfortable and stable life with her husband, Hugo (Johan Heldenbergh). However, her world unravels when she stumbles upon the truth that Hugo is leading a secret double life and carrying on an affair. The devastating shock drives Juliane down a dark path of obsession and revenge, causing her to commit extreme, drastic acts she never thought herself capable of.