Agatha Christie's genre is MYSTERY. She is widely known as the 'Queen of Crime' and is considered to be one of the most successful authors of all time. Her works have sold over two billion copies and have been translated into more than 100 languages. She is best known for her detective fiction, which often featured the characters Hercule Poirot and Miss Marple. Her works are considered to be some of the most influential in the MYSTERY genre.