Renick, Thane, and Lainey plunge headlong into the tides of war. The dragon hunters are drawing closer to the location of the hidden Dragon City. But far worse is their thirst for a dragon heart stone.

Far from home and under threat from the dragon hunters, Renick and his friends rush toward their Dragon Kind friends, hoping to help. Before they reach their goal, they are divided. Now, instead of helping the dragons prepare for war, they must mount a rescue party and dive deep into the heart of enemy territory. If they are successful, war will come sooner. If they fail, one of them will die.