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E-book exclusive extras:1) Christie biographer Charles Osborne's essay on 4.50 from Paddington;2) "The Marples": the complete guide to all the cases of crime literature's foremost female detective.For an instant the two trains ran side by side. In that frozen moment, Elspeth McGillicuddy stared helplessly out of her carriage window as a man tightened his grip around a woman’s throat. The body crumpled. Then the other train drew away. But who, apart from Mrs McGillicuddy’s friend Jane Marple, would take her story seriously? After all, there are no other witnesses, no suspects, and no case—for there is no corpse, and no one is missing. Miss Marple asks her highly efficient and intelligent young friend Lucy Eyelesbarrow to infiltrate the Crackenthorpe family, who seem to be at the heart of the mystery, and help unmask a murderer.