Torin Ten-Tree's debt of service as a trollhunter in Gatewatch has been paid. Now he must decide whether to return home to take up his father's seat in Ten-Tree Hall or to become a Greycloak of Gatewatch along with Grimsa and Wyla. Torin grapples with an unexpected revelation, the long-hidden identity of his mother, just as a delegation brings urgent news of King Araldof Greyraven's grave and sudden illness. Heirless, the Greyraven's death would plunge the land into chaos as the Jarls of Noros entered a struggle of succession. The last desperate hope to keep the realm from wreck and ruin is the legend of a powerful source of healing, the Everspring. Yet, greater questions and graver answers await Torin and his company on the road north through the land of the immortal giants. As long-forgotten secrets are unveiled, they learn not only the cause of the Greyraven's illness but the insidious origins of the evil that first spawned the trolls in the wild woods beyond Gatewatch.