Threatened by a new ice age, the barbaric tribes of the vast Northern Trunda join forces under the bloody rule of warrior chief Morbak to form the Vaalakan army. Only the frontier castle of Torra Alta stands in their way. As Baron Branwolf prepares his defences, ominous sounds emerge from the labyrinth of dragon-built tunnels beneath the castle. His son, Caspar, discovers an ancient dragon’s hoard of treasure, the magical light of a moonstone proves too tempting and Caspar takes it. But alas, it is no ordinary moonstone – it is the Druid’s Eye, and if it falls into the wrong hands, Morbak will be invincible. Only the long -abandoned Runes of War can save Torra Alta, and only Caspar with his newfound power, can find them …