Check out the second book in Terry Brooks’ The Dark Legacy of Shannara trilogy—Bloodfire Quest, out on March 12 from Del Rey:
The quest for the missing Elfstones has gone badly awry. The Druid Order has been decimated, and its surviving leader and her followers are trapped inside the Forbidding—the hellish dimension that imprisons the most dangerous creatures banished from the Four Lands. But now the powerful magic barrier that surrounds the Forbidding is crumbling, and an evil horde is poised to break free . . . unless one young Druid is willing to make the ultimate sacrifice.