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.

Dame Ngaio Marsh was born in New Zealand in 1895 and died in February 1982. She wrote over 30 detective novels and many of her stories have theatrical settings, for Ngaio Marsh's real passion was the theatre. She was both an actress and producer and almost single-handedly revived the New Zealand public’s interest in the theatre. It was for this work that the received what she called her 'damery' in 1966.