I'm relistening to this and it is still perfectly charming. The love of books is wonderful and the sense of humor gentle but it makes me laugh. As I mentioned in my original comments, below, one must simply be (as the omniscient narrator tells us, "tolerant") of the little bookseller's political commentary.
A wealthy young woman's father gets her a job at his friend's second hand book shop in order to teach her about real life. It soon turns into a mystery. Is the bookshop haunted? Or is there something else going on, as the young woman's admirer (a dedicated advertising man)?
I remembered that I began listening to this LibriVox recording some time ago and then stopped when beginning my Lenten podcast fast (yes, SOME time ago!). I picked it up to finish it again and have been really enjoying the low-key mystery, the gentle humor of the advertising man who sees everything in respect to his trade (even his love interest), and the amusing book theories put forth by the bookshop owner (who would not recognize them as being amusing at all, although we do). I have gotten somewhat tired of the bookshop owners continual monologues in the guise of letters to friends about peace versus war. Some is fine but he does go on and on. Overall this is short and a nice period piece that holds interest and introduces us to some interesting characters. I am going to backtrack when I'm done with this and listen to the prequel, Parnassus on Wheels.