The series tells the story of John Nolan, a forty-year-old man who has just divorced and now has no idea what to do with his newfound free time. Everything he once dreamt of is now in the past, and starting a new life from scratch is never easy, especially for someone from a small provincial town. But a chance encounter at the bank turns his life upside down, and John firmly decides to become a police officer. However, upon joining the force, Nolan faces the fact that his presence in the department is not welcomed, with many considering him a "midlife crisis on legs". Now, John must put in maximum effort to prove to everyone that he deserves to be a police officer...