Hoping to save his sick mother, a boy named Gunner and his friend Jo venture into the remote Wild Horse forest to search for a mythical figure who possesses the secret to immortality. When they go missing, Gunner's father Amos must immerse himself in his son's world to find them.
Before Alice went to Wonderland, and before Peter became Pan, they were brother and sister. When their eldest brother dies in a tragic accident, they each seek to save their parents from their downward spirals of despair until finally they are forced to choose between home and imagination, setting the stage for their iconic journeys into Wonderland and Neverland.