A big-game hunter brings a killer leopard to his private island and turns it loose so he can hunt it down. However, unexpected visitors arrive at the island and interrupt his hunt. Meanwhile, the leopard begins to hunt the inhabitants of the island.
A young sailor falls in love with a mysterious woman, performing as a mermaid at the local carnival. He soon comes to suspect the girl might be a real mermaid, who draws men to a watery death during the full moon.