Leo, a former convict, is living in seclusion on an island with his step-daughter, the daughter of his late wife. Leo was framed by a group of former business associates, and he also suspects that one of them killed his wife. He has invited the group to his island, tempting them by hinting about a hidden fortune, and he has installed a number of traps and secret passages in his home. He is aided in his efforts by a former cell-mate who holds a grudge against the same persons. When everyone arrives, the atmosphere of mutual suspicion and the thick fog that covers the island promise a tense and hazardous weekend for everyone.
Horror | Mystery
| George Zucco | … | Leo Grainer | |
| Lionel Atwill | … | Alec Ritchfield | |
| Jerome Cowan | … | Kavanaugh | |
| Sharon Douglas | … | Gail | |
| Veda Ann Borg | … | Sylvia | |
| John Whitney | … | Jeff |