Lily loves to read. She is fascinated by the stories in her books, and reads wherever she goes—through summer, autumn, winter, and spring. But one day, Lily meets a girl who hates reading. Milly invites Lily to have adventures of her own—outside the pages of a book. Together the two friends help each other discover the joy of both backyards and books—and find on the way that adventures are best with a friend along.