The series follows Detective Vic Mackey and his elite strike force, located within an inner-city Los Angeles police precinct. The team is tough, sometime brutal and for the most part effective.
But it's never that simple. Their methods are questionable and their motives are often corrupt.
Mackey faces a difficult time at home, with a wife who wants to leave him, and struggles to balance his professional and personal lives. The precinct captain, Aceveda, is uneasy about the strike team yet uses them to further his political ambitions.
Add to these characters a temperemental and volatile young team of detectives and the resulting clashes are not always just with the criminals.
Season Two premieres with Vic desperately searching for his family while a Mexican drug dealer brutally murders a pair of rival gang members in an effort to gain control of Farmington's cocaine market.
A drug shipment arrives spiked with poison and Vic worries that the Quintero brothers are out to unite two of the neighbourhood's most violent gangs into one - a move that would adversely effect his own drug trade profits.
The Shield creator Shawn Ryan and Scott Brazil are executive producers, with Glen Mazzara and Charles H. Eglee serving as Co-Executive Producers. The Shield is produced by Fox Television Studios in association with Sony Pictures Television.