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Continuing the story in which Tamzin Weston and her guardian pony Moonlight confront the evil spirit of the Grey Horse. Tamzin and her new friend Marga are preparing for the pony Fun Day. But there's something suspicious about Marga and her pony Lossie. First Marga takes Tamzin's protective blue talisman. Then Marga schemes so that Tamzin has to ride Lossie in the parade. Lossie bolts and heads for the cliffs with Tamzin clinging on. She almost falls over the edge but Moonlight rescues her just in time. Marga and Lossie suddenly disappear into thin air. They are agents of the Grey Horse and, according to legend, Tamzin knows he'll be back for her...

When Tamzin goes to stay with her grandmother in Cornwall, she is drawn towards a small grey statue of a grey horse, kept in a cabinet for safe-keeping. One day she accidentally drops the statue and unwittingly releases the evil spirit of the Grey Horse that has been trapped inside. Her mistake threatens to bring storms and danger, and it is only Tamzin who can put things right. To do this she needs the help of the benevolent spirit of the Blue Horse who, according to the ancient legend, defeated the Grey Horse once before. In this third adventure, a newcomer arrives and with his help Tamzin is nearer to solving the mystery behind the ancient legend. But the Grey Horse's power is growing even stronger, putting not only her life in danger but that of the whole village. Hoewever Tamzin is almost sure that the spirit of the Blue Horse is nearby when her favourite pony Moonlight comes to her rescue once again.