A Scotland Yard detective is investigating a string of robberies and a murder, and the information he uncovers leads him to the estate of a wealthy but strange English family, who share their mansion with a group of nuns. The detective comes to suspect that neither the family nor the nuns is quite what they seem to be.

Two female tourists are taken hostage by criminals who are chasing a man recently released from prison who knows the whereabouts of stolen money

During the troubles in Ireland an IRA bomb plot is hatched to blow up a British power station. Sean Rogan (Tom Bell) is an IRA bomb expert and escapes from prison to try and stop the destruction.

Lorna Blake, (Ursula Jeans) is a widow with two daughters. She augments her slender income by using her children to extort money - visiting the houses of the rich to tell a pathetic story and beg for help. And Lorna makes a rich capture when Sir Halmar Bernard, (Cecil Parker), proposes to her. She tells him that she has only one daughter, Molly (Jill Freud, credited as Jill Raymond). When her other daughter, Jay (Jean Simmons), is arrested for forging a cheque, she refuses to help her.

Sequel to "Those Magnificent Men In Their Flying Machines". This time an international car rally from England to Monte Carlo provides the comedic farce.