Rent Agatha Christie's Poirot: Five Little Pigs (2003)

Renowned painter Amyas Crale is murdered, allegedly poisoned by his wife Caroline who went to the gallows for her crime. Fourteen years later in 1938, their grown up daughter Lucy returns from her life in Canada with new evidence - a letter written to her by her mother on the eve of her hanging declaring her innocence. Poirot agrees to dig up the past, but warns Lucy he may discover things she will not wish to hear, but she has to know the truth!