Crime novelist Roger Blackwood competes with hotel house detective Andy McCabe in solving a murder by poisoning at a medical convention.
as Roger Blackwood
as Andrew W. 'Andy' McCabe
as Eleanor Blake
as Olive Temple
as Mr. Claude Harvey
as Dr. John Mason Temple
as Harry Prentice
as Anthony Wilson
as Feets Moore
as Ole
as Hans
as Tessie
as Police Captain
as Girando
as Headwaiter
