Agatha Christie was a mystery writer.
Agatha Christie . Christie 's stage play The Mousetrap holds the world record for longest initial run . And Then There Were None is a mystery novel by English writer Agatha Christie , widely considered her masterpiece and described by her as the most difficult of her books to write . Edgar Award . They honor the best in mystery fiction , non-fiction , television , film , and theater published or produced in the previous year . The Mousetrap is a murder mystery play by Agatha Christie .