Title: Buffy the Vampire Slayer, Volume 13 - Far from Sunnydale - Christopher Golden, Nancy Holder - book
Summary :
Every generation has its Slayer. Today, it's Buffy... Without her, vampires would have no enemy worthy of them and would overwhelm the world. Sunnydale is besieged by the forces of evil, of which vampires are only the vanguard. Now, while Giles is hospitalized, Buffy must face a new threat: a dimensional portal that will allow cohorts of monsters to enter our world. The Slayer, Angel, and their friends must locate this passage and close it. To do this, they will have to leave Sunnydale and go to Boston, home to the mysterious Guardian, who until now has managed to contain the creatures of darkness. Until then...