Miss Marple is intrigued by a story about a child murderer who was never convicted. The teller is found dead the next day - and another murder follows.

The formidable Lady Tressilian (Eileen Atkins, Gosford Park) reluctantly hosts a house party on her Devon estate, where loyal companion Mary and her eccentric old friend Treves help their wheelchair-bound hostess entertain a glittering array of guests. Miss Marple, an old school friend of Lady Tressilian, is intrigued when Treves tells a story about a child murderer who was never convicted. When Treves is found dead the next day - and another murder follows - Miss Marple is determined to find the killer.