Agatha Christie's Poirot: Four and Twenty Blackbirds

The Belgian detective begins to suspect something is amiss when he visits one of his favoured haunts in London for dinner and discovers a fellow regular has dramatically changed his diet. Down in Brighton, elderly Anthony Gascoigne lies dying while his estranged twin brother Henry falls to his death - but nobody is sure whether the man was deliberately pushed. Bizarrely, the key to the riddle seems to lie in a blackberry pie. David Suchet stars in the title role, with Philip Jackson, Hugh Fraser and Pauline Moran