When a business magnate is killed, Miss Marple realises the circumstances of his death recall a nursery rhyme - but what does it mean?

Anna Madeley, Ben Miles, Chris Larkin, Edward Tudor-Pole, Hattie Morahan, Helen Baxendale, Joseph Beattie, Ken Campbell, Kenneth Cranham, Laura Haddock, Liz White, Lucy Cohu, Matthew Macfadyen, Paul Brooke, Prunella Scales, Rachel Atkins, Ralf Little, Rose Heiney, Rupert Graves, Thea Collings, Wendy Richard