Ben is the youngest and most successful thief in the royal city of Quadrivium, but his life takes an unexpected turn when he is recruited by Bella, the queen’s mother, and a giant talking eagle called Murgatroyd to find the Book of Prophecies which was removed from the palace library many years before. They believe the Book will allow them to see into the future and prevent an impending war with the rebels. But Bella also has an ulterior motive: to find her son who went missing while searching for the Book of Prophecies years before.

Ben locates the secret chamber beneath the palace where the Book of Prophecies is kept, only to find that it has already been removed. A single page has been left behind which he must interpret in order to track down the Book itself.