When two maps surface, each bearing the same hidden riddle, nineteen-year-old Elias, a royal mapmaker, sets sail with King Ulises to uncover long-held secrets behind the mysterious disappearance of the king's two young brothers eighteen years earlier.

Eighteen years ago two princes of the island kingdom of St. John del Mar were kidnapped and murdered by the rival kingdom of Mondrago. Elias grew up without his father, killed trying to protect the princes. Mercedes is half-Mondragan, growing up in the shadow of del Mar's hate. Ulises, the youngest and only remaining prince, inherited the throne meant for his brothers. When two maps surface-- each with the same hidden riddle-- they question what really happened. Following the clues in the maps, the three friends uncovering long-held secrets and unimaginable betrayals.