This film begins with a mystery and ends up in mystery, so the title of it is entirely justified. A writer on Bermuda (apparently well off) comes across a young lady lying in the water, carried there by a dolphin. She is unconscious, and when he brings her to life she doesn't know anything about anything, apparently she suffers from amnesia, doctors and the police are contacted, she is photographed and leaves her fingerprints, and when she is left alone with her rescuer they have a relationship. Naturally his wife (they have a daughter) objects about this, but then he wakes up and finds it was all just a dream. However, that dream was so real and intriguing, so he decides to participate in a movie getting shot and have that dream into the story, and the director (James Brolin) is enthusiastic about it. They need a girl to play the lead, a siren kind of figure, and they find just the right girl - who is the very same girl our young writer was dreaming about. Here the plot gets complicated, as a yacht is found abandoned with blood all over it, apparently there has been some mass slaughter on board, and there are many similar stories of people mysteriously disappeared since 1946 without a trace, and this abandoned yacht with blood all over it but no corpses is added to those mysteries. As the shooting of the film proceeds, we learn that the director ("Terry Bamba" - James Brolin) has had something to do with the massacre on the yacht, as he was there filming it, which is proved after his accidental death, but was it accidental? There are numerous other accidental deaths that never are being followed up, and it all comes down to the mysterious lady in white who can't be traced and who apparently takes on identities of people long since dead. There is voodoo and magic and what not involved in this plot, and although it is impossible to sort it all out, It's a fascinating film, the plot is more than intriguing, and it will leave you thinking. After all, there are more things in heaven and earth than in our philosophy.
