Clara, a lawyer in Annecy, leads a serene but monotonous life with her husband Damien and their two children. One night, she falls under the spell of a mysterious sculptor, Stéphane. This one torrid night will have dramatic repercussions for her and her family...

In Lille, Claire Gauthier is an ordinary married woman with a young daughter that works in an insurance company analyzing losses of insured properties. When the single veterinary Laurent Kessler claims damage in his basement caused by a flooding due to water leakage, Claire resolves the situation favorably for him. The weird Laurent visits Claire in her office successively, inviting her for drinks and lunch, and they get close to each other. Meanwhile, a serial killer is terrorizing Lille, killing women with a scalpel. Claire feels a great attraction for Laurent, who has an unusual behavior in her apartment. When Claire sees a scalpel in the pocket of Laurent's jacket, she fears him, but still loves him.

After a skiing accident, Sarah's life is saved thanks to a brilliant surgeon, Dr. Vincent. But when Dr. Vincent mistakes Sara's gratitude for love, he becomes obsessed with her, determined to have her at any cost.

Officer Chris McCullers was gravely injured in a shootout and now works on 911-dispatch. Resentful that her career has ended up here, Chris receives a call from a scared kid and dismisses it as a prank. The next day, she learns that the call was all too real: there's been a murder.