Chantal and Christian live a peaceful retirement in the Parisian suburbs. Since their children, Sandrine and Stéphane, left the nest, they don't give much news. The opportunities to get together as a family are becoming increasingly rare ... When the offspring announce that they will not be coming to celebrate Christmas, it is too much for Chantal and Christian! They then decide to make them believe that they have won the lottery and have become multimillionaires. A desperate attempt to try to bring them back and a lie that could cost them dearly ...