There's something sinister lurking in the waves... It's 1921 in Widow's Peak, a gloomy fishing village on the south coast of New South Wales. Nineteen-year-old Missy Green fills her days helping her fisherman father on his trawler, and spending time with her grandfather, the town's reclusive lighthouse keeper. It's a dreary existence. Everything in her sea-salt-soaked life is upended, though, when she glimpses something in the water - a mermaid staring ominously at her. When Missy discovers the dead body of a woman washed up on shore, her disturbing hallucinations of the mermaid gather steam. Missy must navigate the treacherous waters of her secret-filled town while attempting not to drown in the recesses of her mind - and in the eyes of a handsome detective...
