Ben is the youngest and most successful thief in the royal city of Quadrivium, but an unexpected encounter with Bella, the queen's mother, changes his life forever. In return for a substantial reward Ben agrees to track down the Book of Prophecies which disappeared from the palace library many years before. It is believed that the Book contains a prophecy which will save the kingdom from an impending war with the rebels. Yet Bella also has an ulterior motive, to find her son who went missing whilst searching for the same book.
Ben returns home to the royal city of Quadrivium expecting a hero's welcome. Instead, he finds the city in turmoil. The king has been found dead in suspicious circumstances, clearing the way for someone to rule the kingdom through the infant prince. Ben immediately suspects his old enemy, the pale man. Or could it be the vainglorious Cardinal Bolt, who shows an excessive interest in the Book of Prophecies? The race for the heir is on when the prince is discovered to be missing.