Betty Fisher (Sandrine Kiberlain) is a successful novelist whose life is struck by tragedy when her only son falls from his bedroom window and later dies in hospital. Sometime later Margot (Nicole Garcia), Betty's mother, sees a young boy playing in the street nearby and brings him home to serve as a replacement son for Betty. The boy's mother, Carole (Mathilde Seigner), then reports the disappearance to the police, helping to set off a chain of events which bind the protagonists together in ways they never expected. Adapted from a novel by Ruth Rendell.

Laurent Tirard co-writes and directs this French family comedy based on the 1950s comics by René Goscinny. Eight-year-old Nicolas (Maxime Godart) has a perfect set-up, with loving parents, good friendships and a happy school life. His idyllic existence soon changes, however, when he misinterprets a conversation that he overhears between his parents (Valérie Lemercier and Kad Merad), leading him to believe that his mother is pregnant. With his imagination running wild, he soon jumps to the conclusion that his parents will be too wrapped up with their new arrival to spare any time for him, and quickly sets about planning how to keep things just the way they are.