A Little More Than Kin — Joss Whedon

Angel is troubled by a spate of nightmares but has to leave the investigation to Faith and Fred. Discovering that Angel's dreams aren't victimless, they follow the trail to a slew of missing students from a local prep school. To get to the heart of the mystery, they attain gainful employment at St. Cuthbert's Preparatory School, where the mysterious deaths are linked to a growing teenage-vampire population. Meanwhile, having joined Buffy and her gang to battle a fearsome and powerful new enemy in the States, Angel returns to London in the midst of the vampire threat. But he hasn't returned alone, and he, Faith, and Fred suddenly have double the trouble--the fight is on in Magic Town!