Tamzin is trying hard to come to terms with the loss of Moonlight, whom she now knows is the Blue Horse, the kind spirit who is trying to protect her. Although the evil spirit of the Grey Horse has been quiet for some time, Tamzin is inexplicably drawn towards a rocky outcrop just off the coast and goes out in a little boat to investigate. Soon she realises it is a trap and the Grey Horse has succeeded in capturing her in his den.