Rinehart is considered the source of the phrase "The butler did it" from her novel The Door (1930), although the novel does not use the exact phrase. Rinehart is also considered to have invented the "Had-I-But-Known" school of mystery writing, with the publication of The Circular Staircase (1908).
So many unkind things have been said of the affair at Morris Valley that I think it best to publish a straightforward account of everything. The ill nature of the cartoon, for instance, which showed Tish in a pair of khaki trousers on her back under a racing-car was quite uncalled for. Tish did not wear the khaki trousers; she merely took them along in case of emergency. Nor was it true that Tish took Aggie along as a mechanician and brutally pushed her off the car because she was not pumping enough oil. The fact was that Aggie sneezed on a curve and fell out of the car, and would no doubt have been killed had she not been thrown into a pile of sand. It was in early September that Eliza Bailey, my cousin, decided to go to London, ostensibly for a rest, but really to get some cretonne at Liberty's. Eliza wrote me at Lake Penzance asking me to go to Morris Valley and look after Bettina. . . .