The Circular Staircase Mary Roberts Rinehart - The Circular Staircase is a mystery novel by American writer Mary Roberts Rinehart. The story follows dowager Rachel Innes as she thwarts a series of strange crimes at a summer house she has rented with her niece and nephew. The novel was Rinehart's first bestseller and established her as one of the era's most popular writers. The story was serialized in All-Story for five issues starting with the November 1907 issue, then published in book form by Bobbs-Merrill in 1908.

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.