Buffy and Angel. The Slayer and the vampire. And 'the ultimate tragic romance', as Angel describes it. But Buffy and Angel's love life is just one of many things to come under threat when, after an attack by a strange lupine creature, the vampire suddenly turns against his friends. Now, time is quickly running out for the Slayer and her boyfriend. Buffy is in one of her tightest spots ever - for in order to save Angel, she will have to move fast, think even faster, and accept the help of her single worst enemy.