Reagon家族是纽约市有名的警察世家,一家几代人都在执法部门工作,有的还献出了生命。Frank Reagon(Tom Selleck)是纽约市警察局现任局长,也是Reagon家族的「掌门人」。他父亲Henry(Len Cariou)担任局长期间,曾因为政治上「处理失当」而惹过不少麻烦--偏偏这位老警官非常固执,对自己做过的任何事情都没有悔意。如今「父债子偿」,Frank在管理庞大的警员队伍的同时,还要不停弥补父亲当年遗留的「老大难」问题。Jamie has a poor first impression of his cocky new partner Vinny Cruz, from a different precinct. Ignoring PR advice, Frank compromises himself when visiting the family of an honest cop's hasty mistake fatal victim, then antagonizes the while force by bluntly apologizing in the media, yet makes up by preventing the traumatized cop's suicide attempt. Incorrigible criminal Benjamin Walker, who lost everything when duly arrested by Danny, finally made parole and is likely to make true his promise to exact revenge, on Danny or his family.