Characters played by Emrys Jones
Matthews
Barlow
Characters played by Zena Marshall
Ann Farrington
Characters played by John Horsley
Inspector Clements
Characters played by Joan Hickson
Mrs. Fenton
Characters played by Hector Ross
Canning
Characters played by Victor Platt
Sergeant
Characters played by Roger Maxwell
Col. Smythe
Characters played by Lesley Deane
Mrs. Smythe
Characters played by George Pastell
Ferrari
Characters played by Marne Maitland
Heinz
Characters played by Frederick Piper
Mr. Pritchard
Characters played by Cyril Chamberlain
Bit Part
Characters played by Edward Evans
Publican
Characters played by Ian Fleming
Dr. Wilson
Characters played by Alan Gordon
(uncredited)
Characters played by Frank Hawkins
Police Constable
Characters played by Anthony Woodruff
Boatman
Characters played by Martin Wyldeck
M.I.5 Man