On the brink of World War II, a family is forced out of their London home and into the countryside. Wolfie and his older sister Dodo are devastated to leave behind everything they've ever known, but they slowly settle into their new life. One day they come across an orphaned foal, which they raise as Hero, a strong and beautiful horse who lives up to his name when he saves the children from a fire. Wolfie and Dodo find comfort in their new life, but...