Third and final film in the 'Inspector Hornleigh’ series of comedy-thrillers. Inspector Hornleigh (Gordon Harker), disappointed at not being handed an important spy case, is assigned by Scotland Yard to an army barracks to investigate the mundane thefts of supplies from the stores. This accidentally leads Hornleigh and Sergeant Bingham (Alastair Sim) to a nest of fifth columnists when his dim-witted assistant carelessly talks to a girl in the cafeteria – and that night, news of Hornleigh and Bingham’s arrival is embarrassingly transmitted back to Germany.
Gordon Harker
as Inspector Hornleigh
Alastair Sim
as Sergeant Bingham
Phyllis Calvert
as Mrs. Wilkinson
Edward Chapman
as Mr. Blenkinsop
Charles Oliver
as Dr. Wilkinson
Raymond Huntley
as Dr. Kerbishley
Percy Walsh
as Inspector Blow
David Horne
as Commissioner
Peter Gawthorne
as Colonel
Wally Patch
as Sergeant Major
Betty Jardine
as Daisy
O.B. Clarence
as Professor Mackenzie
