Morley's sequel to Parnassus on Wheels, his second love letter to the bookselling trade, The Haunted Bookshop, finds Mifflin and McGill now married and ensconced in Brooklyn. When Aubrey Gilbert, a young advertising man, visits the shop, he falls for Mifflin’s assistant, Titania. 

But something is amiss. The ghosts of literature aren’t the only mysterious visitors in Mifflin’s bookshop, where books disappear and reappear, but Mifflin is too distracted to notice. Gilbert takes Titania's safety into his own hands. Her life—and the Mifflins’—may depend on it. 

The rollicking plot provides ample doses of diversion, while allowing Mifflin (i.e., Morley) to expound on the intricacy of the bookseller's art.