Twelve unexplained phenomena with no apparent earthly explanation � A dog-shaped gunpowder mark; an omen from `the other side'; a haunted house; a chilling s�ance; a case of spilt personalities; a recurring nightmare; an eerie wireless message; an elderly lady's hold over a young man; a disembodied cry of `murder'; a young man's sudden amnesia; a levitation experience; a mysterious SOS. To discover the answers, delve into the supernatural storytelling of Agatha Christie.

Agatha Christie was born in Torquay in 1890 and became, quite simply, the best-selling novelist in history. Her first novel, The Mysterious Affair at Styles, written towards the end of the First World War, introduced us to Hercule Poirot, who was to become the most popular detective in crime fiction since Sherlock Holmes. She is known throughout the world as the Queen of Crime. Her books have sold over a billion copies in the English language and another billion in over 100 foreign languages. She is the author of 80 crime novels and short story collections, 19 plays, and six novels under the name of Mary Westmacott.