Isle of Blood and Stone

Eighteen years ago, two princes vanished. Now a riddle hidden on a mysterious map could chart a course towards the truth . . . and the missing royals in this historical fantasy that's perfect for fans of And I Darken and Grave Mercy.  
Nineteen-year-old Elias, a royal mapmaker and friend of the newly crowned king, is eager to explore uncharted waters. But when two maps surface, each with the same riddle, Elias must put aside his next voyage to solve a mystery that has plagued the kingdom for eighteen years—what happened to their two young princes, both kidnapped on one tragic day? Following the hidden clues, Elias uncovers long-held secrets and unimaginable betrayals. This fantasy adventure is full of intrigue and schemes, romance and friendship, and fearless explorers searching for the truth.