When Milo's uncle and Tilly's grandfather are poisoned by a mysterious copy of "The Wizard of Oz" and fall into a deep sleep, Milo and Tilly travel to the Emerald City to find out who is behind the poisoning.

Eleven-year-old Tilly Pages, who has found comfort in her grandparents' bookshop since her mother's disappearance, now learns that she can bookwander into any stories, and decides to seek her mother.

Mary Anne takes a job in a bookstore, but when strange occurrences--such as the sound of a throbbing heartbeat and the appearance of a screeching raven--transpire, the ghost of Edgar Allan Poe may be to blame. Mary Anne takes a job in a bookstore, but when strange occurrences--such as the sound of a throbbing heartbeat and the appearance of a screeching raven--transpire, the ghost of Edgar Allan Poe may be to blame