"Well, I don't know how many there are - I suppose it's infinite, really! But... I've met a really nice one who calls himself Koschei, a past - regeneration? That's the word, isn't it? - and a future regeneration - " He face clouded for a moment, then she gave a bright smile. "Oh, and one who was a woman!"
Her eyes twinkled up at him. "And of course, there's you."