A grieving Border Collie named Moss struggles to recover his spirit after a traumatic injury, while his caretaker Diane attempts to restore his purpose through the discipline of sheepherding. Diane, a young woman burdened by guilt over Moss's past, seeks to reconnect with the dog by convincing his owners to allow her to train him for competition. The narrative follows their developing bond against the backdrop of the Pragers' busy garden center and the surrounding rural environment. As they navigate the complexities of animal training and mutual trust, a sudden, dangerous encounter with a diseased animal forces them to confront external threats that test their resolve and safety.

Readers frequently highlight the author's ability to capture the specific behavioral traits of working dogs with precision. Discussion often centers on the emotional weight of the protagonist's guilt and how it mirrors the dog's own withdrawal from his former life. Critics note that the pacing balances the quiet, methodical process of training with the sudden tension of the external conflict. The narrative is often praised for its grounded approach to animal behavior, avoiding overly sentimental tropes while maintaining a focus on the necessity of purpose for both human and animal characters.