A well-meaning and gentle inventor creates a machine capable of allowing one person to completely control the mind of another, but before he can market it, he must test it. A volunteer comes forth and the experiment begins. All goes well until the inventor's jealous, angry wife intervenes and takes over the subject. She uses the hapless fellow for her own pleasure and to do her bidding. As time passes, she becomes increasingly cruel to him. The inventor finds himself powerless to stop his wife and this prompts him to take desperate measures to stop her.