The books were auctioned individually at two separate auctions one online auction on July, 2 and one in person on July 16. Books included first editions, first American editions, and one signed first edition. Meanwhile, her 1924 Poirot Investigates first edition sold for £1,524. A total of 14 Agatha Christie books sold separately summing £19,886. Agatha Christie, known for her 66 detective novels and 14 short-story collections is widely known for detectives Hercule Poirot, Tommy and Tuppence, and Miss Marple .