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The inventive magician Professor Mordini (Lynton Brent) hires Buster Keaton and his wife (Elsie Ames) as caretakers for his contraption-filled home. He warns them to make sure that his disgruntled former assistant doesn't get in and steal his ideas while he's away. After being scared silly by numerous spooky goings on (including an inebriated penguin on roller skates!), the Keatons are confronted by Mordini's ex-assistant (Bruce Bennett) as well as by a spiritualist (Dorothy Appleby) and her husband (Don Beddoe). The assistant uses the house's creepy resources to send both married couples running for the hills in terror.