Parnassus on Wheels is Morley's first novel, about a fictional traveling book-selling business. The original owner of the business, Roger Mifflin, sells it to 39-year-old Helen McGill, who is tired of taking care of her older brother, Andrew. Andrew is a former businessman turned farmer, turned author. As an author, he begins using the farm as his Muse rather than a livelihood. When Mifflin shows up with his traveling bookstore, Helen buys it—partly to prevent Andrew from buying it—and partly to treat herself to a long-overdue adventure of her own.
Christopher Darlington Morley (May 5, 1890 – March 28, 1957) was an American journalist, novelist, essayist and poet. He also produced stage productions for a few years and gave college lectures. Morley's first novel, Parnassus on Wheels, appeared in 1917. The protagonist, traveling bookseller Roger Mifflin, appeared again in his second novel, The Haunted Bookshop in 1919.