[crutledge]

Mary Roberts Rinehart (August 12, 1876-September 22, 1958) 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.

Excerpt
The trail is narrow—often but the width of the pony's feet, a tiny path that leads on and on. It is always ahead, sometimes bold and wide, as when it leads the way through the forest; often narrow, as when it hugs the sides of the precipice; sometimes even hiding for a time in river bottom or swamp, or covered by the débris of last winter's avalanche. Sometimes it picks its precarious way over snow-fields which hang at dizzy heights, and again it flounders through mountain streams, where the tired horses must struggle for footing, and do not even dare to stoop and drink.