Boston police officer Cooper Harrison never thought he'd go back to his hometown, Harmony Farms. But when his faithful K-9 partner Argos is killed in the line of duty, Cooper, caught in a spiral of trauma and grief, has nowhere else to turn. Jobless and on the verge of divorce, he accepts a offer for the position of dog officer in Harmony Farms, leaving the life he spent twenty years building behind. And so he finds himself back where he started. Where his father was once known as the town drunk and his brother outgrew juvenile delinquency to become a drug dealer. Where he grew up as 'one of those' Harrisons. Cooper does his job with deliberate detachment, refusing to get emotionally invested in another dog the way he had with Argos--until he finds himself rescuing a wounded and gun-shy yellow lab gone feral. Cooper never thought he'd find himself going back in order to move forward, and yet Harmony Farms is the one place where Cooper must learn to forgive and, only then, heal. All with the help of a yellow dog.