There's definitely stuff to like about Swan Song, like most McCammon--he's the best of the faux-Kings, with a crazy sort of energy and invention (especially in his earliest books, the ones he now refuses to allow to be reprinted). My favourites of his are They Thirst, Stinger, Baal and Bethany's Sin, though I recently read The Wolf's Hour for the first time, about a Nazi-fighting werewolf, and that was NUTS.