Erin is a police horse: as gentle as anything and afraid of nothing. Until she is grabbed by an aggressive dog. She is left with a significant wound, which is healing nicely. But the wound in her heart is less easy to heal. No matter what Jeanine, her rider, tries, Erin maintains a deep-seated fear of dogs. This means that, to her great sadness, Erin is no longer allowed to remain in the police force. She ends up with Lieke, with whom she immediately clicks. Lieke, just like Erin, would love to go on outdoor rides. She decides to help Erin with her fear, but how can one girl succeed where all the police specialists have failed?