[crutledge]

Mary Roberts Rinehart (August 12, 1876-September 22, 1958) was a prolific author often called the American Agatha Christie.[1] 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 Crown Prince sat in the royal box and swung his legs. This was hardly princely, but the royal legs did not quite reach the floor from the high crimson-velvet seat of his chair.
Prince Ferdinand William Otto was bored. His royal robes, consisting of a pair of blue serge trousers, a short Eton jacket, and a stiff, rolling collar of white linen, irked him.