Directed by Paul Unwin. Poirot embarks optimistically upon an unprecedented challenge, but soon fears that the case may be as cut and dried as it had first appeared. Five Little Pigs. The following version of the novel was used to create this study guide: Christie, Agatha. Sixteen years after Caroline Crale has been convicted of the murder of her husband, Amyas Crale, her daughter, Carla Lemarchant, approaches Poirot to investigate the case. William Morrow Paperbacks, 2004. Lucy Crale enlists Poirot to investigate the 14-year-old murder in which her mother was hanged for poisoning her artist father. With David Suchet, Rachael Stirling, Aidan Gillen, Toby Stephens.