Remember that time when Buffy's little sister Dawn first found out that Buffy is the Slayer? And then when Angel almost killed Dawn, because no one had told her that he'd turned evil again? Buffy and the gang all have memories connected to Dawn, and only Buffy and Giles know they're not real.

But there are still a lot of unanswered questions as to how Dawn came into Buffy's life, and where these memories come from. Now, Dawn has vanished without a trace, and the Scooby gang has no clue where to find her.

But Buffy will stop at nothing to find her little sister, even if she has to face off against a cadre of crazed, bloodsucking monks and a former Vampire Slayer turned Slayer Vampire.