After an unsettling encounter with the Dracula, Buffy asks Giles to once again be her Watcher. Luckily he agrees, for Buffy is about to face mortal problems far more threatening than the undead: the sudden appearance of a sister named Dawn, her mother's mysterious illness and Spike's undying devotion. Then an undefeatable demon appears, forcing Buffy to turn to an ancient Spirit Guide who tells her that love is her greatest gift - and power.