Night Tide

A young sailor is attracted to a mysterious mermaid performing at a carnival, but soon suspects that the girl is actually a siren who draws men to their watery deaths during the full moon.

Night Tide is a 1963 drama horror movie directed by Curtis Harrington, starring Dennis Hopper, Luana Anders, Linda Lawson. It holds an IMDb rating of 6.4/10 from 4,715 votes and runs 1h 26m.