Despite denouncing her former life as the dreaded Ilse Witch, Grianne Ohmsford still has bitter enemies within the Third Druid Council. Among the highest ranks lurk those who cannot forget her reign of terror, who covet her seat of power, and who will stop at nothing to see her deposed - or destroyed. Even Grianne's few allies know of the lots against her. But they could never anticipate her sudden, ominous disappearance in the dead of the night without a trace.

Despite denouncing her former life as the dreaded Ilse Witch, Grianne Ohmsford still has bitter enemies within the Third Druid Council. Among the highest ranks lurk those who cannot forget her reign of terror, who covet her seat of power, and who will stop at nothing to see her deposed, or destroyed. Even Grianne's few allies know of the lots against her. But they could never anticipate her sudden, ominous disappearance in the dead of the night without a trace.

When the world was young, and its name was Faerie, the power of magic ruled - and the Elfstones warded the race of Elves and their lands, keeping evil at bay. But when an Elven girl fell hopelessly in love with a Darkling boy of the Void, he carried away more than her heart. Thousands of years later, tumultuous times are upon the world now known as the Four Lands. Users of magic are in conflict with proponents of science. Elves have distanced their society from the other races. The Druid order is threatened.

Brave explorers led by the last Druid, Walker Boh, traveled across unknown seas in search of an elusive magic. But now it seems that Walker and his team were lured there for sinister, unforeseen purposes. As the crew aboard the airship Jerle Shannara is being attacked by evil forces, the Druid’s protégé, Bek Rowe, and his companions are being pursued by the mysterious Ilse Witch. Meanwhile, Walker is alone, caught in a dark maze beneath the ruined city of Castledown.

When a half-drowned elf is found floating in the seas of the Blue Divide, an old mystery resurfaces. Thirty years ago, an elven prince led an expedition in search of a legendary magic said to be more powerful than any in the world. Of all those who set out on that ill-fated voyage, not one has ever returned. Until now. The rescued elf carries a map covered with mysterious symbols - and Walker Boh, the last of the Druids, has the skill to decipher them.