blue bloods is an american police procedural drama television series that airs on cbs on september 24, 2010. it stars tom selleck, donnie wahlberg, len cariou, and bridget moynahan. its main characters are members of the fictional reagan family, an irish-american catholic family in new york city with a history of work in law enforcement, especially in the new york city police department (nypd). the series is set and shot in new york city.