Thông tin phim

An unidentified woman engages in a brutal fight with a man in a car and finally dispatches him with a shot to the head.

Five years earlier, the same woman, Riley North, is working as a banker in Los Angeles struggling to make ends meet. Her husband Chris owns a failing mechanic shop. They have a ten-year-old daughter, Carly. Chris's friend tries to talk him into robbing Diego Garcia, a powerful drug lord. Chris turns him down, but not before Garcia has already discovered his involvement and ordered his men to make an example of him. Riley and Chris take Carly out for pizza and to a carnival for her birthday since no one showed up to her party. As the family walks to the car, Diego's men gun down Riley's husband and daughter in a drive-by shooting. She is wounded but survives.

Despite her injuries, Riley is able to positively identify the shooters. The detectives handling the case are hesitant to pursue charges against the three, as they are members of Garcia's drug cartel, which wields considerable influence.

Prior to the preliminary hearing, Riley is visited by the perpetrators' lawyer, who tries to bribe her. She refuses the bribe, but the lawyer notices she has anti-psychotic medication at home and uses this information to paint her as an unreliable witness. Judge Stevens, who is secretly on the cartel's payroll, declares there is insufficient evidence to allow the perpetrators to stand trial and dismisses the case, while the prosecuting lawyers do nothing. Outraged, Riley tries to attack her family's killers, but is subdued and ordered to be held at a psychiatric ward. En route, she escapes and vanishes.

Five years later, Detectives Beltran and Carmichael arrive at the site of the carnival and find the three shooters hanging from a ferris wheel, having been killed by Riley. The killings attract the attention of FBI agent Lisa Inman. Inman explains to Beltran and Carmichael that before vanishing, Riley robbed the bank she used to work at, and that she has now returned, having robbed a gun store and obtained various assault rifles and ammunition.

Riley kills Judge Stevens by blowing up his house, having already killed the defense and prosecution lawyers involved. Inman, Carmichael and Beltran decide to tell the media about Riley, which causes a debate on social media between those who see her as a hero and those who see her as a criminal.

Riley heads to a business that is a front for Diego's money laundering, where she kills most of his men. Diego realizes Riley is responsible for his recent shipments going missing and resolves to kill her. Inman discovers Riley has been living on Skid Row, owing to recent changes to crime patterns in the area. She finds Riley's van, which is filled with the stolen weapons, and learns that the people there see Riley as their guardian angel for keeping them safe.

Riley survives a trap set by Diego, follows his henchmen to Diego's home, and kills many of his men. When Diego's young daughter—who evokes her own murdered child—interrupts her as she confronts Diego, she hesitates and Diego wounds her and escapes. Inman calls Carmichael to Skid Row to wait for Riley. Carmichael, secretly on Diego's payroll, arrives and shoots Inman dead, then notifies Diego of Riley's likely destination.

Riley returns to Skid Row, which is swarming with Diego's men. She manages to kill several of them and finds Inman's body. Using Inman's phone, she contacts the media and reveals her location, inviting both the media and LAPD. She confronts Diego, stalling him long enough for the police to arrive. Diego shoots Carmichael and runs, only to be beaten down by Riley. Surrounded by police, Riley shoots Diego in the head and is, in turn, shot by the police, yet manages to escape.

Beltran finds her critically wounded at her family's gravestone and has her brought to the hospital, despite Riley's expressed desire to die. Beltran later visits her, telling her that there are those who agree with what she did, and slips her the key to her handcuffs, allowing Riley to escape again.

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