Classic Ealing comedy in which a group of bank robbers struggle to silence the eccentric old lady who discovers their crime. Mrs Wilberforce (Katie Johnson) lives alone in King's Cross with her parrots. She has been led to believe that the group of men renting rooms from her, Professor Marcus (Alec Guinness), the Major (Cecil Parker), Louis (Herbert Lom), Harry (Peter Sellers) and One-Round (Danny Green), are classical musicians. However, when one of the group's cases gets caught in the door and opens to reveal, not a musical instrument, but a plethora of banknotes, the virtuous Mrs Wilberforce vows to go to the police with the identities of the men. The criminals agree that the old lady has to be killed to silence her, but will this be as straightforward as it sounds?