The house guests at Styles seemed perfectly to Captain Hastings: there was his own daughter Judith, an inoffensive ornithologist called Norton, dashing Mr Allerton, brittle Miss Cole, Doctor Franklin and his fragile wife Barbara, Nurse Craven, Colonel Luttrell and his charming wife Daisy, and the charismatic Boyd-Carrington.

So Hastings was shocked when Poirot declared that one of them was a five-times murderer. True, the ageing detective was crippled with arthritis, but had his deductive instincts finally deserted him?…

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.