Natalie Babbitt

Young Winnie Foster, stifled by the formality of her proper life and her domineering mother, escapes into the woods only to get lost. Her magical summer begins when she meets Jesse Tuck. Jesse is full of life and adventure and Winnie falls in love. The Tuck family has a powerful secret-- a spring that holds the magic of everlasting life. Now Winnie must choose whether she wants to live life as she knows it or drink from the spring.