Johnson (Kyra Sedgwick) traveled from Atlanta to Los Angeles to serve as the acting sheriff of the Special Crime Investigation Unit, specializing in investigating murders that have troubled the police and excited the media. This sounds like a glamorous position, but it is actually very troublesome to do it, because Johnson has to face a group of stubborn men, each of whom has his own personality and ideas, and they all think they are the smartest one. However, as time goes by, Johnson gradually gains the recognition and trust of the detectives. Every time, she can rely on her unique wisdom and means to get the conclusive evidence she wants from those vicious criminals. There are even some seemingly unsolvable cases that only Johnson can solve. Under the leadership of Johnson, the momentum of the entire investigation team is getting higher and higher.