"幽霊書店" by Christopher Morley is a novel published in 1919. Set in Brooklyn at the end of World War I, this bibliomystery follows young advertising man Aubrey Gilbert as he becomes entangled with bookshop owner Roger Mifflin and his new assistant, Titania Chapman. When mysterious events unfold—a book repeatedly vanishes and reappears, Gilbert is attacked, and suspicious figures lurk about—Gilbert suspects a sinister plot. As he attempts to protect Titania, the truth proves far more dangerous than kidnapping, involving espionage and an international conspiracy.