Twenty-six-year old Mathieu (Pierre Niney) has always aspired to become a famous author, but despite all his efforts, he has never managed to be published. Meanwhile, he earns his living by working for a moving company. One day on a removal job, his destiny takes a new turn as he stumbles across the manuscript of an elderly and solitary man who has recently died. Initially hesitant, Mathieu eventually decides to steal the text and pretend he wrote it. Unexpectedly, he quickly becomes the bright new star of French literature. Everyone is now eagerly anticipating his second novel, and as each day passes and pressure mounts, Mathieu plunges ever deeper into a criminal spiral of lies in order to keep his dark secret hidden.