For reasons known only to himself, the King of the Silver River has charged young Penderrin Ohmsford, barely more than a boy, with the daunting task of rescuing his aunt, Grianne, Ard Rhys of the Druid order, from her forced exile in the terrifying dimension of all things damned: the Forbidding. With the noble dwarf Tagwen and the prodigal elven princess Khyber Elessedil by his side–and with the outcome of the bloody war between the Federation and the Free-born at stake–Pen has accepted his mission without question. But not without risk . . . or sacrifice.