After the discovery of an inert body at the bottom of a swimming pool, a cleaner in charge of removing the blood stains remains alone in the pit. Mysterious events are about to take place... From the very first minutes, the suspenseful nature of La Fosse grips the viewer. At the heart of this film is a single location: an empty swimming pool. This simplicity allows the spectator to be held in suspense and to stir up emotions. The architecture of the pool and the joints of the tiles are all vanishing lines that underline the graphic aspect of the image and highlight the work of the director of photography.