Immortal

During a routine slaying, Buffy encounters a vampire named Veronique who knows the slayer's name and can anticipate her attack. One who doesn't have the proper respect for Mr. Pointy. One who cannot die. If slain, she will reincarnate in a new body.
An invincible demon is the last thing Buffy needs right now. Joyce Summers is about to undergo a serious operation, calling up all of her daughter's fears about her own mortality. Angel wants to comfort Buffy, but her mother's crisis underscores the differences between them: he will live forever, while she will grow old...or die young.
Torn between her duties as the Chosen One, Buffy needs the support of her friends to help her solve a rash of grave robberies, head off an influx of new vampires, and take Veronique down once and for all. For Veronique is on a mission to bring about the unification of her masters, the Triumvirate, into one all-powerful demon that will drink the blood of the last man on earth...