Masterpiece Mystery!
Season 39, Episode 20 of 31 :  Miss Marple, Series Iv: A Pocket Full Of Rye

When Miss Marple learns of the deaths of businessman Rex Fortescue (Kennetth Cranham, Valkyrie), his young wife, Adele, and their housemaid, Gladys, the circumstances vividly recall the nursery rhyme "Sing a Song of Sixpence." Since Miss Marple had trained Gladys herself, she has a personal reason to investigate. Will her reasoning and deduction make sense of the rhyme and at last reveal the culprit?