First published in 1971. This copy was the first issue by Fontana in 1974.
Cover painting by Tom Adams
A letter from a dead friend promises Miss Marple 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 must know a murderer's secret...