A man is murdered in a room with no windows and a steel lined door which locks only from the inside.
Superintendent Meredith
Lexman
Ramon Karadis
Grace
Linda Buckland
Sergeant Anson
Fisher
Manservant
Jock
Sergeant Butterfield
Landlady
Finch
Viney
Amis
Brennan
Secretary (C.I.D.)
Commissioner of Police
