Deep in the woods near Winnie Foster's cottage lies a secret spring that grants immortality to those who drink from it. When Winnie discovers the spring, she encounters the Tucks--a family that has been blessed (or cursed) with everlasting life. While a mysterious stranger plots to uncover the location of the spring to use for his own purposes, Winnie must learn to trust the Tucks as she faces decisions that could change her life forever.