Lillian Garis was an American author who wrote hundreds of books of juvenile fiction between 1915 and the early 1940's. She used the pseudonyms Margaret Penrose and Laura Lee Hope when writing for the Stratemeyer Syndicate. After the success of the Motor Boys series the Stratmeyer syndicate began a similar series for girls. Books in this series included The Motor Girls - A Mystery of the Road, The Motor Girls on a Tour - or, Keeping a Strange Promise, The Motor Girls Through New England - or, Held by the Gypsies, The Motor Girls on Cedar Lake - Or the Hermit of Fern Island, and The Motor Girls on Waters Blue - or, The Strange Cruise of The Tartar. An excerpt reads, "The girl stepped over to a window and looked out. There, on the driveway, stood a new automobile. Four-cylindered, sliding-gear transmission, three speeds forward and reverse, long-wheel base, new ignition system, and all sorts of other things mentioned in the catalogue. Besides, it was a beautiful maroon color, and the leather cushions matched. Cora looked at it with admiration in her eyes."