The King of the Dead (Trilogy)
"Like his people, the King of the Dead Men beyond Dunharrow is a cursed soul. In ages past, he and his army had renounced their pledge of allegiance to the King of Gondor and fled to their mountain homes. Since that time, they lay bound by a curse to the shadowy depths beyond Dunharrow as bodiless spectres, awaiting the chance to honor their broken oath. Only a true King of Gondor can wield the power to release the dead King and his ghostly multitudes from this curse. Thus for many an age they have haunted the Paths of the Dead, awaiting the one who can set them free."