Marine biologist Dr. Mornay discovers a giant sea serpent and keeps it close to study the creature. Mornay feeds the beast with sheep, but only teaches it a lust for blood. Mornay’s son and his fiancée arrive and help him prepare a deadly bait.
An ensemble of circus artistes decides to make some big money and operates as a gang of criminals. Masterminded by the “midget” Lilliput they rob and steal. But ghost-like Fate steps in and sabotages their heists. In the end the last remaining members kill off each other.
The devil sets a trap for optometrist Harry Lenz. In disguise he lets him have magic glasses which reveal the thoughts of others. At a moment’s notice, Lenz goes for a life of crime and high finance. Years later Satan comes to collects his dues. Surprisingly not Lenz’s soul, but just his eyesight.
John Drune runs the "Devil's Den" night club. Because he's too cheap to buy a fireproof dress, his dancer Helen perishes in a dangerous flame dance. She returns from the grave to teach him a dancing lesson.