The library stretched infinitely in every direction. Shelves rose so high that the ceiling was lost in a soft, golden haze. Nora Seed walked slowly, her fingers brushing the spines of books that each contained a different life she could have lived.

"Every regret you have," Mrs. Elm had said, "is a book waiting to be opened." Nora stopped in front of a volume bound in deep burgundy. The title read: My Life as a Glaciologist. She had always wondered what would have happened if she'd pursued science instead of music.

With trembling hands, she pulled the book from the shelf. The moment she opened it, the library dissolved around her, and she was standing on a frozen plain, wind biting her cheeks, the northern lights dancing overhead...