Dr John Curran is a lifelong fan of Golden Age detective fiction and one of Ireland's foremost experts on classic crime. For many years he edited the official Agatha Christie Newsletter and helped to establish the Agatha Christie Archive. He was consultant to the National Trust during the restoration of Greenway House and wrote his doctoral thesis on the Golden Age of Detective Fiction at Trinity College, Dublin. His two volumes about Agatha Christie's notebooks won three major US mystery awards (the Agatha, Anthony and Macavity), and his history of Collins' Crime Club, The Hooded Gunman, was nominated for an Edgar and won the 2019 H.R.F. Keating Award for best critical book related to crime fiction. He set up the annual Bodies from the Library conference at the British Library and is in demand as a speaker and lecturer on Agatha Christie from his home in Dublin.

Agatha Christie is known throughout the world as the Queen of Crime. Her books have sold over a billion copies in English with another billion in over 70 foreign languages. She is the most widely published author of all time and in any language, outsold only by the Bible and Shakespeare. She is the author of 80 crime novels and short story collections, 20 plays, and six novels written under the name of Mary Westmacott.