Cuckolded and dismissed from her job, Lucille leaves her suburbs and goes to Paris without much hope of finding anything better. As soon as she arrives, she saves a desperate man from drowning. Pierre is also a cuckold, but in terms of work he is rather better off than Lucille: co-president of a large company, he lives in a luxurious apartment with a view of the Seine. To thank his benefactress, he lodges her for one night ... This situation suits Lucille well, who decides to join in.