Buffy the Vampire Slayer: Season Eight

Dispatched on one last mission as a Slayer, Giles has sent her to assassinate a rogue Slayer who he claims will be the end of all life. But Faith has encountered the last complication she thought she'd ever run into... she likes the girl. She and Genevieve have more in common than Faith has had with anyone in a long time.But this blossoming friendship leaves her in an impossible position... as Genevieve plans to kill Buffy. If she does nothing, she allows Buffy to die but saving Buffy would expose her to Genevieve.