Taking place a generation after The Talismans of Shannara, The Voyage of the Jerle Shannara: Ilse Witch opens with the discovery of a body. Only two people understand its significance: Walker Boh, the last of the Druids and a familiar character to Shannara fans, and the Ilse Witch, a beautiful but dark young woman who wields a potent magic. Thus begins the voyage of the Jerle Shannara in a race to uncover the mystery, which of course includes an unusual cast of characters.

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.

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.

Since the death of the Druid Allanon, the Four Lands have changed profoundly, with magic strictly forbidden in the Southland, now under totalitarian rule. Yet Par still has some power of the Wishsong. A message from Allanon arrives: venture to the dread Hadeshorn, along with the other Scions of Shannara. For in the future, all life in the Four Lands will be destroyed. To prevent this terrible fate, Allanon commands Par to recover the long-lost Sword of Shannara, a task that is next to impossible.  

Five hundred years have passed since the devastating demon-led war that tore apart the United States, leaving nothing but scorched and poisoned ruins, and nearly exterminating humankind. Those who escaped the carnage and blight were led to sanctuary by the boy savior known as the Hawk—the gypsy morph.