In the wake of the Second Wave, the angel menace has exploded, and Alex and Willow are on the lam. They connect with a fledgling group of angel killers, and Alex takes charge of training. Meanwhile, Willow dreams of a mysterious boy, and when brooding, gorgeous Seb shows up in the flesh, he turns out to be another -- possibly the world's only other -- half angel. When Alex enlists this rival to help keep Willow safe, he can't predict what chemistry will pass between them . . . or how far Willow might go to keep Alex safe. Will their love endure or spell doomsday for the human race?