The question ate at her even now, when the answer couldn't change anything.

What was it inside her that jumped higher, ran faster, and healed with such great speed? What whispered in her ear about her enemies' weaknesses, no matter how they tried to hide them?

What brought her together with a vampire, once when he'd done little but warn her of unseen dangers, and again when he'd become the most dangerous of all?

Buffy knew about the First Slayer. Angel had done the research and told her the results. What had that girl become? What did that make her?