Red Vipereen is plotting to take over Prince Rupert's palace and world-famous stables. The palace psychic predicts eleven-year-old, Edwin Goodchild, is the only one who can help. Big sister, Holly, doesn't believe her wimpy brother can save anyone. What Holly doesn't know is that Edwin possesses undiscovered superpowers. But when the prince's most prized horse, Black of Saingland, is abducted, can Edwin rise to the challenge and combat the might of Red Vipereen and his terrifying witches?