Mary Roberts Rinehart was a prolific author often called the American Agatha Christie. She is considered the source of the phrase ‘The butler did it’, although she did not actually use the phrase herself, and also considered to have invented the ‘Had-I-But-Known’ school of mystery writing.Rinehart wrote hundreds of short stories, poems, travelogues and special articles. Many of her books and plays were adapted for movies, such as The Bat (1926), The Bat Whispers (1930), and The Bat (1959). While many of her books were best-sellers, critics were most appreciative of her murder mysteries.