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Parnassus on Wheels is Christopher Morley's first novel, and the first of two written from a woman's perspective, the second being The Haunted Bookshop, this book's sequel. Parnassus on Wheels was inspired by a novel by David Grayson (pseudonym of Ray Stannard Baker) called The Friendly Road, and is prefaced by a letter to Grayson from Morley. The word "Parnassus" from the title refers to "Mount Parnassus," the home of the Muses in Greek mythology.