"She is the last. She is the last unicorn in the world."
"She would be." Molly sniffed. "It would be the last unicorn in the world that came to Molly Grue." Molly said, "It's all right. I forgive you."
"Unicorns are not to be forgiven." The magician felt himself grow giddy with jealousy, not only of the touch but of something like a secret that was moving between Molly and the unicorn. "Unicorns are for beginnings," he said, "for innocence and purity, for newness. Unicorns are for young girls."
Molly was stroking the unicorn's throat as timidly as though she were blind. She dried her grimy tears on the white mane. "You don't know much about unicorns," she said.
One of my favorite books, ever.