Strange Boarders

Strange Boarders is a 1938 British comedy thriller film, directed by Herbert Mason for Gainsborough Pictures and starring Tom Walls, Rene SaintCyr, Googie Withers and Ronald Adam. The film is an adaptation of the 1934 espionage novel The Strange Boarders of Palace Crescent by E. Phillips Oppenheim, and was well received by critics. The Los Angeles Times described it as a long series of laughs as well as thrills.

The man for the job is top secret service agent Tommy Blythe Walls, who happens to be on honeymoon with new wife Louise SaintCyr. He is summoned back to London under conditions of absolute secrecy, not allowed to divulge any details even to Louise, who naturally does not believe his unconvincing cover story and jumps to the conclusion that he is having an affair.Enquiries lead to the Notting Hill boarding house where the dead woman lived and Tommy takes a room there incognito to try to infiltrate what is assumed to be a nest of spies. Louise follows him to London and confronts him, and he is forced against orders to take her into his confidence. She also takes a room and the couple pretend not to know each other, giving their names as a Mr. Bullock and a Miss Heffer. Together they set about the task of observing and investigating the sundry assortment of fellow lodgers, knowing that some are completely innocent while others harbour dark and treacherous secrets which threaten the very nation. From the grasping landlady Mrs. Dewar Irene Handl and the meek maid Elsie Withers, through to fellow boarders including a blind man Adam, a Boer War colonel and his wife apparently in retirement, a travelling salesman, a scatty old biddy and a merchant of Argentinian meat, all come under suspicion before the wily pair of sleuths manage to untangle the web of lies and false leads to reveal who in the household is or is not a traitor. ........

Source: Wikipedia