The poor fisherman 'Jonas' lives in despair, hauling in empty nets every day. Then one day, he catches a 'mermaid', a legend of the sea. He and the dazzling, mysterious sea creature begin a passionate relationship, and from that day on, his nets start filling with fish as if by magic. 'Jonas' believes she is a sea fairy who brings good luck and succumbs to her fatal seduction every night. However, as his catches increase, his body grows thinner and his health deteriorates rapidly...