Actually Dragonsbane isn't a stand-alone novel. Barbara Hambly has released two other novels in the series, Dragonshadow and The Demonknight, with a fourth and presumably last book on the way. The sequelae are good, although the second one made me want to throw it across the room due to it just sort of . . . ending. My suspicion is that the fourth book was split from the third because together they were longer than the publisher wished.