The film uses almost real shots to go deep into the darkest corners of the crime city. The film premiered in Los Angeles on September 17, 2012, and former Governor Arnold Schwarzenegger also appeared on the day of the premiere. Taylor (Jake Gyllenhaal) and Zavala (Michael Pena) are a pair of work partners, and they are also good brothers in life. They patrol the streets of Los Angeles together, going through life and death, and experiencing family life such as marriage and the birth of children. However, after a routine patrol, they discovered a secret activity of the gang. And this discovery also made them a thorn in the eyes of the biggest drug dealer in Los Angeles. So, a cat-and-mouse game of good and evil and disparity in power began...