Torin Ten-Trees and his closest companions, Bryn and Grimsa, set out to join The Gatewatch and become trollhunters. When a troupe of meddling dwarves throws them off course they are captured by trolls and taken as prisoners to a secret gathering deep underground. There they learn that an ancient giant has crowned himself king of the trolls and plans to utterly destroy The Gatewatch. Their perilous journey back to the land of sun and stars will stretch their strength to the limit, strain their wits, and demand an unspeakable sacrifice. But will it be enough to defeat the Troll King? The Gatewatch is an epic troll-hunting adventure inspired by the Norse Myths and the Icelandic Sagas.