Erin is a police horse: as docile as can be and afraid of nothing. Until she's attacked by an aggressive dog. She's left with a large wound, which is healing beautifully. But the wound in her heart is harder to heal. No matter what Jeanine, her rider, tries, Erin retains a deep-seated fear of dogs. This means, to her great sorrow, that Erin can no longer remain in the police force. She ends up with Lieke, with whom she immediately clicks. Lieke, like Erin, is eager to go on trail rides. She decides to help Erin with her fear, but how can one girl succeed where all the police specialists have failed?