Gérard Lanvin is offered a big role in an American blockbuster, which tells the landing in Provence in August 1944. The big-budget filming takes place in the South of France, so it is fortunate that he goes there. On site, Gérard will meet Momo Zapareto who takes care of the maintenance of the swimming pool of the house in which he must live during the filming. But Momo is a fan, a very fan… too much a fan! He knows and has seen all his films, and very quickly will do everything to make himself indispensable in the eyes of his idol and the film crew. For Gérard, the nightmare has only just begun...