In Venice-Long Beach, CA, a very young, sailor-suited Dennis Hopper gets involved with a mysterious young woman who may or may not be both a mermaid and a killer. The mystery ultimately is rather disappointingly rationalized, except insofar as the involvement of one occasionally-glimpsed person goes unexplained. Moody, quiet, eerie, and dreamlike; similar to "Carnival of Souls" in tone, though not quite a horror movie. Worth a look.