Teri lives on a small farm with her father. They live a happy life, but things change as their mare, Charly, gives birth to a foal that appears to be a unicorn. A veterinarian and family friend named Dr. Reilly helps Teri adjust and come to grips with how her life is changing as she grows up in her changed world. When personal tragedy strikes the family, Teri must face the fact that her world will never be the same and that sinister elements exist who will try to rob her of what happiness she finds. Her friends and family stand by her, but Teri finds that she must stand alone and face evil to survive.