Although his murdered friend was by all accounts a scoundrel, Edward Wales is determined to trap his killer by staging a seance using a famous medium. Many of the 13 seance participants had a reason and a means to kill, and one of them uses the cover of darkness to kill again. When someone close to the medium is suspected she turns detective, in the hope of uncovering the true murderer.
Conrad Nagel
as Richard Crosby
Leila Hyams
as Helen 'Nellie' O'Neill
Margaret Wycherly
as Madame Rosalie La Grange
Helene Millard
as Mary Eastwood
Holmes Herbert
as Sir Roscoe Crosby
Mary Forbes
as Lady Alice Crosby
Bela Lugosi
as Inspector Delzante
Charles Quatermaine
as Dr. Philip Mason
Moon Carroll
as Helen Trent
Cyril Chadwick
as Brandon Trent
John Davidson
as Edward 'Ned' Wales
Bertram Johns
as Howard Standish
