Buffy the Vampire Slayer. The Dust Waltz TPB

Two mysterious sisters, Lilith and Lamia, arrive in Sunnydale and bring along some nasty beasts. Buffy tries to find out who or what they are. This plan is complicated when one of the sisters takes a liking to Angel. The sisters turn out to be ancient vampires; each hopes to bring a champion to town to fight to death in a magical ritual called the Dust Waltz. The Waltz involves ritual murder, blood drinking, an opened Hellmouth, and apocalypse. Meanwhile, the Scooby Gang shows Giles's niece the town.