Ex-policeman Colin Butcher had just set up his own pet detective agency searching for lost and stolen pets. It was running smoothly but he realised he needed a partner. Enter Molly, an unloved and unwanted cocker spaniel rescued from a classifieds website. Clever and charismatic, she melts Colin's heart, the two are soon inseparable. With Colin by her side, Molly cracks cases and solve crimes across the country, using her exceptional sense of smell to locate missing pets and reunite them with their grateful owners. By turns charming, moving, and thrilling, this story explores how pets and humans can form beautiful connections and unbreakable bonds.