Bertrand Bonello stars as “Bertrand,” a filmmaker approaching his next project with a peculiar obsession—monstrosity. Convinced it should be the central theme of his film, he fixates on the notion of monstrous imagery, visiting museums and even hiring a mysterious art historian (played simultaneously by Jeanne Balibar and Géraldine Pailhas) to help him find the painting that best embodies the idea (considering works by Francis Bacon, Caravaggio, and others). But to his shock, the mania consuming his mind begins to manifest itself in his body as a monstrous red stain takes shape on his back. A disquieting yet fascinating (and funny!) mixture of body horror and character study, co-starring Barbet Schroeder as a physician and Joana Preiss as Bertrand’s wife, Barbe.