Cooper Harrison, a member of the Boston K-9 unit, never thought he would ever go back to his hometown, Harmony Farms. But when his faithful canine partner, Argos, is killed in the line of duty, Cooper finds himself mired in grief. Jobless, on the verge of divorce, and in a self-destructive rut, Cooper has little choice but to accept an offer for the position of animal control officer in Harmony Farms.

And so he finds himself back where he started. Where his father, Bull, was once known as the town drunk. Where his brother, Jimmy, was a delinquent and a bully. Where he grew up as...