Answer the following question: Build a movie plot around this: Who's corpse in the bathtub Michel Delassalle
Answer:
A second-rate boarding school is run by the tyrannical and mean Michel Delassalle (Meurisse). The school is owned, though, by Delassalle's teacher wife, the frail Christina (Clouzot). Delassalle also has a relationship with Nicole Horner (Signoret), another teacher at the school. Rather than antagonism, the two women are shown to have a somewhat close relationship, primarily based on their apparent mutual hatred of Michel, who is physically and emotionally abusive to both, as well as unkind to the children.Unable to stand his mistreatment any longer, Nicole devises a plan to get rid of Michel forever. Though hesitant at first, Christina ultimately consents to help Nicole. Using a threatened divorce to lure Michel to Nicole's apartment building in a remote village several hundred kilometers away, Christina sedates him. The two women then drown him in a bathtub and dump his body in the school's neglected swimming pool. When his corpse floats to the surface, they think it will appear to have been an accident. Almost everything goes according to their plans until the body fails to surface. Michel's corpse is nowhere to be found when the pool is drained.Nicole sees in the paper that the police have found the corpse. However, when Christina goes to the morgue, she learns it is not actually Michel's body. There she meets Alfred Fichet (Vanel), a retired private detective. He becomes involved in the case, much to Nicole's chagrin.When Christina and Alfred come back, a boy is punished for breaking a window; the boy says it was Michel who punished him. After hearing this, Christina becomes very sick and is unable to be photographed for the school photo. However, it appears that Michel appears in the photo standing in the back next to a window. Nicole becomes worried and leaves the school.Christina, overcome by fear, tells Alfred everything. He does not believe her, but he investigates the pool. That night, Christina hears noises and wanders the school. When she realizes that someone is in the school, she runs back...