Henry Carson (John Le Mesurier) owns a seedy Soho night club called The Blue Parrot which becomes the centre of a police investigation following the murder of a small-time gangster.
The investigation is led by Superintendent Chester (Ballard Berkeley) who sends in Sergeant Maureen Maguire (Jacqueline Hill) to work undercover.
Irish actor Dermot Walsh plays a very unconvincing American detective called Bob Herrick, who for reasons unknown is assisting Scotland Yard with their investigation.
It’s a stilted, by-the-numbers effort but it passes an hour and nine minutes pleasantly enough.
Lt. Bob Herrick
Sgt. Maureen Maguire
John Le Mesurier
Mrs Eva West
Guido ‘Taps’ Campelli