First of all, THUNDER ROCK is a psychological drama, but the film has very much hidden beneath its surface. This film comes disguised as a rather peculiar fantasy tale, but the truth is that it deals with reincarnation, a fact that's already revealed in the first scenes: A message is passed on by telephone from one office clerk to another, and to another and another. Like knowledge that is transmitted from one life to another.
David (Michael Redgrave) who is living completely on his own in a secluded lighthouse, finds a logbook with an old passenger list. This allows him to tune into his subconscious mind to open up the memories of his past lives. The drowned people, "immigrants from the old world": Each one of them represents a part of David's character. Each one of them could have been a person he once was in a former life. If you believe in reincarnation, this is a film you must see. However, Michael Redgrave is superb and so is the rest of the cast in this beautifully photographed film classic.