Professor Marcus (Alec Guiness) rents a room from kindly, old Mrs. Wilberforce (Katie Johnson). He tells her he's a musician as are his pals (including Peter Sellers and Herbert Lom) and they need a quiet place to rehearse their classical music. They are, however, a gang of robbers planning their next heist and they intend to use the old lady to pull off the job.
This drôle 1955 black comedy is from the Ealing Studio. The heist is carried out despite the old lady's constant, well-intentioned, and funny interruptions, she gradually realizes her part in it, and justice prevails with lots of giggles. Guiness, sporting a large overbite and flyaway hair, is charmingly devious as the gang leader, but it is the inimitable Katie Johnson who steals the show. She's so likable and convincing, completely inhabiting the role of the befuddled, sweet landlady who is blithely unaware she is surrounded by criminals.
Highly recommended for those who enjoy classic British comedy.