After Miss Marple is made a trustee of a merchant marine training vessel, a fellow trustee is poisoned, and ship's officers are later murdered after she comes on board.
After the enforced absence of their father, three children move with their mother to Yorkshire, where during their adventures they attempt to discover the reason for his disappearance.
Frankie Howerd stars in this comedy as a lowly boot-boy who is a terrible coward. He only goes to war in 1914 after he has been hypnotised to 'save England'. With the German master plan ...