Winnie Foster is in the woods, thinking of running away from home, when she sees a boy drinking from a spring. Winnie wants a drink too, but before she can take a sip, she is kidnapped by the boy, Jesse Tuck, and his family. She learns that the Tuck family are blessed with - or doomed to - eternal life since drinking from the spring, and they wander from place to place trying to live as inconspicuously as they can. Now Winnie knows their secret. But what does immortality really mean? And can the Tucks help her understand before it's too late?