Lucrèce (Mélanie Laurent) is the best contract killer in the business. She is looking to go clean but accepts one final job: eliminate an opera singer that owns a tract of land that’s desperately wanted by a British oil firm. A trained singer, Lucrèce takes part in a recital at a Swiss chateau, in which her target will be performing. But when she arrives for rehearsals, she can’t bring herself to complete the contract. As the night of the concert approaches, Lucrèce learns that a second hitman has arrived, and that she is his target...