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.

Lucy Foley is a No.1 Sunday Times, Irish Times and New York Times bestselling author, whose contemporary murder mystery thrillers have sold over five million copies worldwide. She is a Waterstones Thriller of the Month author, a three-time nominee at the British Book Awards, and The Guest List was a Reese's Book Club pick. As a lifelong Agatha Christie fan, Lucy has also contributed to Marple, a collection of short stories featuring the legendary detective.