London, 1888: on the night of the third Jack the Ripper killing, soft-spoken Mr. Slade, a research pathologist, takes lodgings with the Harleys, including a gloomy attic room for "experiments." Mrs. Harley finds Slade odd and increasingly suspects the worst; her niece Lily (star of a decidedly Parisian stage revue) finds him interesting and increasingly attractive. Is Lily in danger, or are her mother's suspicions merely a red herring?
Jack Palance
as Slade
Constance Smith
as Lily Bonner
Byron Palmer
as Insp. Paul Warwick
Frances Bavier
as Helen Harley
Rhys Williams
as William Harley
Sean McClory
as Constable #1
Leslie Bradley
as Constable #2
Tita Phillips
as Daisy (the maid)
Lester Matthews
as Chief Insp. Melville
Harry Cording
as Detective Sgt. Bates
Lilian Bond
as Annie Rowley
Isabel Jewell
as Katy
