Oh, I just saw that title in one of my newsletters, but didn't take the time to check it out. Sounds interesting.
It kind of reminds me of the 1917 novel, Parnassus on Wheels by Christopher Morley which was about a traveling bookseller (for the most part, also a woman) and set the US. It was Morley's first novel and The Haunted Bookshop was its sequel. Parnassus on Wheels was inspired by David Grayson's novel, The Friendly Road: New Adventures in Contentment (1913) according to Wikipedia.
Morley is another native Pennsylvanian. He moved around a bit, including a stint in England as a Rhodes Scholar, came back to PA for a bit and then finally settled in Roslyn Estates , NY, where he died and was buried in 1957. Ah, hah, he was the one that wrote Kitty Foyle. Does anyone remember that movie?