Celebrated actress Joan Hickson makes her mark once more in this period thriller as Jane Marple, a determined lady with an unassuming air and a flair for solving crime. "Stonygates" is a home for young offenders run by Lewis Serrocold. When he's threatened with a gun at a family gathering, he ushers Edgar out and calmly takes control. Shots are heard and the body of a relative is discovered in another room. Something odd about the murder is compounded by a second death until Miss Marple stumbles on a conjuring set. Hey presto! A little magic of her own reveals the killer's trick.