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.
George Zucco
as Leo Grainger
Lionel Atwill
as Alec Ritchfield
Jerome Cowan
as John Kavanaugh
Veda Ann Borg
as Sylvia Jordan
Sharon Douglas
as Gail
John Whitney
as Jeff Kingsley
Jacqueline deWit
as Emiline Bronson (as Jacqueline DeWit)
Ian Keith
as Dr. Lake
George Lloyd
as Allerton, Butler
