While visiting a Caribbean island, a man witnesses voodoo rituals that change humans into monsters. Stealing some of the elixir he returns home to Sarno Gulch and uses the elixir on himself and his new bride.; Peter Dane comes into possession of a potion that turns men into leopard-like beasts. Dane gets addicted to the stuff and even gives it to his wife Alice. She does not go wild, though, just faints. Peter is ready to kill his lethargic wife, but is pushed down a rockface by the spirit of the native chief.; Sculptress Rhoda Prahar is romanced by the twins Paul and Alan Ryan. She likes them both and models a warrior statue after the likeness. Alan manages to win her heart, but jealous Paul kills his brother and marries Rhoda a year later. Since Rhoda is of Hungarian heritage, her statues harbor the souls of the dead. When Paul develops a persecution mania, he strangles Rhoda, but is attacked and killed by the statue of his dead twin brother.