Diabolique (1996)
The wife and mistress of a cruel school master collaborate in a carefully planned and executed scheme to murder him. The plan goes well until the body, which has been strategically dumped, disappears. The psychological strain starts to weigh on the two women when a retired police investigator begins looking into the man's disappearance on a whim. husband wife relationship, violent husband, romantic rivalry, plan gone wrong, conspiracy, mistress, extramarital affair, heart condition, boys' school, abusive husband, sadistic husband, unfaithful husband, poisoned drink, disappeared corpse
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