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.

Agatha Christie, renowned as the 'Queen of Crime,' is the author of over 100 works, most famously her mysteries featuring Hercule Poirot and Miss Jane Marple. Her books have sold over two billion copies worldwide (she is outsold only by the Bible and Shakespeare). Most of Agatha Christie's works have been dramatized for television and/or cinema, notably Murder on the Orient Express. Christie's The Mousetrap (1952) is the longest-running play in history and is performed to this day at St. Martin's Theatre in London's West End. Agatha Christie was made a Dame Commander of the British Empire in 1971. She died in 1976. Please visit the official Agatha Christie website: www.agathachristie.com.

Learn more at: www.harpercollins.co.uk