Twelve-year-old Filippo has never known his father – the jeweller who created the priceless Ocean of the Moon diamond. But when a mysterious visitor claims the jeweller has been kidnapped, Filippo sets off on a dangerous journey into the East, encountering bandits, warlords and greedy shahs all with one aim in common: to find and claim the precious diamond. But Filippo has a secret of his own; and on this journey, he can trust no one.