There are 2 books in the Parnassus Series series. The newest book is The Haunted Bookshop which came out in 2021.

1
Parnassus on Wheels

Book cover of Parnassus on Wheels
"Parnassus on Wheels" (1917) was Christopher Morley?s first published novel. It tells the story of Roger Mifflin, who sells his travelling book business to 39-year-old Helen McGill. The latter is tired of taking care of her ailing older brother Andrew, a businessman, farmer, and author. The novel is told from…
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2
The Haunted Bookshop

By Christopher Morley , Mint Editions (contributor),

Book cover of The Haunted Bookshop

The Haunted Bookshop (1919) is a novel by Christopher Morley. Although less popular than Kitty Foyle (1939), a novel adapted into an Academy Award-winning film, The Haunted Bookshop is a fast-paced thriller that deserves a modern audience. From unassuming beginnings as a tale about a lovelorn advertising salesman who visits…