During a storm, mermaid Liana sees an unconscious woman fall into the water from a sinking ship. Liana doesn't see any other people around to help the woman, or anything that could be used as a life raft, so she saves the young woman's life in the only way she knows how: by pulling her beneath the surface and turning her into a mermaid.

Felix saw the mermaid dive toward his sister April during the storm. He blames the sirens both for the storm and for April's death, and now, unaware that his sister is one of them, he wants all mermaids to be exterminated.