The vizzen war is over but the palace is far from peaceful. Lord Gavindro, a foreign diplomat, arrives unexpectedly at the palace, his motives unclear. Endomer suspects something sinister lurks behind Lord Gavindro's supposed negotiations for trade, but Krollis refuses to listen to his concerns. When the contention between the two brothers escalates to the breaking point, Endomer leaves Korin and sails to Lord Gavindro's country to unearth the truth.

Across the sea, he discovers the threat goes far deeper than he imagined. A new enemy is on the rise, possessing weapons unlike anything seen before. Alone and far from home, Endomer is the only one who can stop the threat. To save his kingdom, he must face a dark villain determined to vanquish his people and all he's ever known.