主角約翰諾蘭（John Nolan）在多數人的職業生涯最高峰時，毅然決定離開舒適圈，前往洛杉磯警局追求當名警察的夢想。現在的他成為了警局中最老菜鳥，身邊圍繞著 20 多歲的新秀們，他必須在這個充滿危險、幽默又不可預測的「年輕」警察世界中前進，決心讓自己的人生活出第二次的精彩。

A down and out cop lands the case of a lifetime when four suspects are nabbed in the assassination attempt of a prime time journalist. The case turns out to be a devious maze where nothing is what it looks like. The pursuit of it leads him to the dark netherworld - the 'Paatal Lok', and to shocking discoveries in the past of the four suspects.

Real cops, real cases and calls for help. Four cases, four human destinies. Get to know the work of the police close! Some actors are real cops but this show is not supported by the real police! Some cases may be based on reality.