 Based on the Agatha Christie novel. A letter for Miss Marple from a recently deceased friend (Mr Rafiel - her friend and fellow detective in A Caribbean Mystery) promises a large reward for investigating a crime - without telling her who was involved, or when it happened! When she accepts, she is given a reservation for a coach tour of historic homes and gardens. She has fifteen fellow-passengers - and one of them knows a murderer s secret and someone is preparing to kill...