Post War British spy thriller starring Phillip Friend, Mary MacKenzie and Allan Cuthbertson. At the Hotel Maychester in London, fashion reporter Kyra Gabaine (Mary Mackenzie) is reunited with her war-time lover Felix Gretton (Philip Friend). Gretton was a rising intelligence officer in Brussels when his wartime relationship with Kyra compromised security and in the post-war years he is now a hotel waiter. Kyra believes she has seen a fugitive spy in the hotel and recruits store detective and retired Scotland Yard inspector Fred Borcombe (Leslie Dwyer) to investigate the suspect, now posing as dress designer Peppi Gilroudian (John G. Heller). The only clue they have to go on is a note mentioning Stanwell, the UK atomic research facility, but their investigations uncover a web of espionage and intrigue!