Mygale [MIG-uh-lee] n.: a genus of large tropical spiders. . . .
Richard Lafargue, a well-known plastic surgeon, pursues and captures Vincent Moreau, who raped Lafargue's daughter and left her hopelessly mad in an asylum. Lafargue is determined to exact an atrocious vengeance, and an ambiguous, even sadomasochistic relationship develops between self-appointed executioner and victim.