Young Winnie Foster, stifled by the formality of her proper life and domineering mother, escapes into the woods only to get lost. Soon she happens upon Tuck—a boy full of life and adventure who's unlike anyone she's ever met—and falls in love. The Tucks, a kind and generous family, have a powerful secret: a spring that holds the magic of everlasting life. And now, Winnie must choose to live life as she knows it or drink from the spring.