Welcome to No.12 rue des Amants. A beautiful old apartment block, far from the glittering lights of the Eiffel Tower and the bustling banks of the Seine. Where nothing goes unseen, and everyone has a story to unlock. The watchful concierge, the scorned lover, the prying journalist, the naïve student, the unwanted guest... There was a murder here last night. A mystery lies behind the door of apartment three. Who holds the key?