El Tren de las 4,50= 4:50 from Paddington

Elspeth was not a woman usually given to hallucinations. But when she witnesses what appears to be a woman being strangled on a train and apparently she is the only one who sees it, no-one reports it and no corpse is found, she turns to her old friend Jane Marple to help solve the puzzle. Marple asks her highly efficient and intelligent young acquaintance, Lucy Eyelesbarrow to infiltrate the Crackenthorpe family, who seems to be at the heart of the mystery, and help unmask a murderer.