When eleven-year-old Tilly Pages joins Oskar and his family on a Christmas trip to Paris, she and her friend bookwander into the land of fairy tales, where someone--or something--is causing chaos.

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.

"When Milo, Tilly, Oskar, and Alessia venture into Arthurian legend to find the first bookwanderer--the wizard Merlin--they discover that the magic of bookwandering is not at all what they thought. Together, they must journey into Greek and Roman mythology to bargain with the trickster Loki and find a way to untangle the Alchemist's grip on the world's imagination. And to save Pages & Co. and protect the very foundations of bookwandering, the friends...