"Carla Le Marchant learns a disturbing family secret; her mother, Caroline Crale, died in prison after being convicted for poisoning her father.

Caroline leaves an intriguing legacy in the form of a letter professing her innocence and, believing this to be true, Carla is determined to clear her mother's name.

Enlisting the help of Justin Fogg; the son of her mother's defence lawyer, Carla searches out all the players from her tragic history and brings them back to the scene of the crime to uncover the truth.

Suspects, secrets, and red herrings abound in this classic 'Whodunit' packed with intrigue, murder and suspense from the pen of the great Dame Agatha Christie."