Poirot is called in to investigate the kidnapping of three-year old Johnnie Waverly, the son of Marcus Waverly, from his home, Waverly Court in Surrey. Prior to the kidnapping, the family received anonymous letters that threatened to take the boy unless twenty-five thousand pounds was paid. The police took little interest until the final letter which stated that the boy would be kidnapped at twelve o'clock the next day.
Dame Agatha Mary Clarissa Christie, DBE (nee Miller; 15 September 1890 - 12 January 1976) was an English crime novelist, short story writer, and playwright. She also wrote six romances under the name Mary Westmacott, but she is best known for the 66 detective novels and 14 short story collections she wrote under her own name, most of which revolve around the investigations of such characters as Hercule Poirot, Miss Jane Marple, Mr Satterthwaite, and Tommy and Tuppence. She also wrote the world's longest-running play, The Mousetrap. Born into a wealthy upper-middle-class family in Torquay, Devon, Christie served in a hospital during the First World War, before marrying and starting a family in London. She was initially unsuccessful at getting her work published; but in 1920 The Bodley Head press published her novel The Mysterious Affair at Styles, featuring the character of Poirot. This launched her literary career. The Guinness Book of World Records lists Christie as the best-selling novelist of all time. Her novels have sold roughly 2 billion copies"