When ten-year-old Winnie Foster stumbles on their secret, the Tucks take her home and explain why living forever at one age is less a blessing that it might seem. Complications arise when Winnie is followed by a stranger who wants to market the spring water for a fortune.

    It turns out the dog, which Marty names Shiloh, belongs to Judd Travers who drinks too much and has a gun—and abuses his dogs. So when Shiloh runs away from Judd to Marty, Marty just has to hide him and protect him from Judd. But Marty's secret becomes too big for him to keep to himself, and it exposes his entire family to Judd's anger. How far will Marty have to go to make Shiloh his?