Michel Delassalle is a tyrannical and mean principal at a second-rate boarding school. The school is owned, though, by Delassalle's teacher wife, the frail Christina. Delassalle also has a relationship with Nicole Horner, another teacher at the school. Rather than antagonism, the two women have a somewhat close relationship, primarily based on their 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, they hatch a plot to kill Michel. After drowning him in a bathtub, they dump his body in the school's neglected swimming pool. However, when the swimming pool is drained, Michel's corpse is nowhere to be found.