When the body of a half-drowned elf is found floating in the seas of the Blue Divide, an old mystery resurfaces. Thirty years ago, an expedition in search of a legendary, ancient magic set out. But none who went ever returned. Until now. For the rescued elf carries a map covered with mysterious symbols only one man can decipher. That man is Walker Boh, the last of the Druids. But one other person understands the map's significance - the Ilse Witch, a beautiful but twisted young woman, who wields a magic as potent as Walker's own. She will stop at nothing to possess the map - and the magic it leads to. To stop her, Walker must find the magic first. And thus begins the voyage of the sleek, swift airship Jerle Shannara. The company chosen by Walker must fly into the face of unknown terrors while the Ilse Witch and her dark allies follow, waiting to strike...