It's a Penny to a Pony... Murder Will Out!
Miss Marple and Mr. Stringer are witnesses to the death by heart attack of elderly, rich Mr. Enderby. Yet they have their doubts about what happened. The police don't believe them, thus leading Miss Marple to yet again investigate by herself.
based on novel or book
heart attack
horseback riding
amateur detective
testament
barn
covered investigation
eavesdropping
black and white
murder mystery