The dream is unusually vivid: Bank employee Vince Grayson finds himself murdering a man in a sinister octagonal-shaped room lined with mirrors while a mysterious woman breaks into a safe. It is so vivid that Vince suspects it may have really happened. To get the dream off his mind, he goes on a picnic with some relatives. When a thunderstorm forces his party into a nearby mansion, Vince discovers that the bizarre room does exist, and it means nothing but trouble.
Paul Kelly
as Cliff Herlihy
DeForest Kelley
as Vince Grayson
Ann Doran
as Lil Herlihy
Kay Scott
as Betty Winters
Charles Victor
as Captain Warner
Robert Emmett Keane
as Lewis Belknap, aka Harry Byrd
Jeff York
as Deputy Torrence (as Jeff Yorke)
Gladys Blake
as Bank Clerk (uncredited)
Julia Faye
as Rental Home Owner (uncredited)
John Harmon
as Clyde Bilyou (uncredited)
Richard Keene
as Mr. Kern (uncredited)
Janet Warren
as Mrs. Dorothy Belknap (uncredited)
