It has been 100 years since Agatha Christie wrote her first novel and created the formidable Hercule Poirot. In this biography, Laura Thompson describes the Edwardian world in which she grew up, explores the relationships she had, including those with her two husbands and daughter, and investigates the mysteries still surrounding Christie's life - including her disappearance in 1926.

Agatha Christie is a mystery and writing about her is a detection job in itself. But, with access to all of Christie's letters, papers and writing notebooks, as well as interviews with her grandson, daughter, son-in-law, and their living relations, Thompson is able to unravel not only the detailed workings of Christie's detective fiction but the truth behind her private life as well.