In the chaotic aftermath of the Cataclysm, King Genn Greymane's worgen-cursed Gilneans and Malfurion Stormrage's night elves are forced into an uneasy alliance against the Forsaken and the Horde forces pressing into Ashenvale, testing whether old grudges can be set aside fast enough to survive a war neither side chose. Richard Knaak's novel gives the newly playable worgen race its introduction to Warcraft's ongoing story.
Summary by Loreful, from public sources