Law Abiding Citizen

In a Philadelphia home invasion, Clarence Darby murders the wife and daughter of engineer Clyde Shelton, who is forced to watch. Prosecuting attorney Nick Rice is unable to securely convict Darby due to mishandled evidence. Unwilling to risk lowering his high conviction rate, he makes a deal with Darby; in exchange for testifying against his accomplice, Rupert Ames (who only intended to steal from Clyde and flee), Darby will plead guilty to third degree murder and receive a lighter sentence. Ames is convicted and sentenced to death, while Darby is released after a few years. Clyde feels betrayed by Nick and the justice system.

Ten years later, Ames is executed via lethal injection, but some of the execution chemicals had been switched and Ames dies in agonizing pain; evidence implicates Darby, who is alerted to by an anonymous caller of law enforcement coming to arrest him. The caller, using an electronically distorted voice and knowledge of cocaine and a possibly underaged woman in his apartment, warns Darby that he's looking at life in prison. Darby hijacks a police car, forcing a lone officer to drive to a deserted warehouse. The officer reveals that he is Clyde, and was also the caller. Darby attempts to shoot Clyde, instead, the gun paralyzes Darby with tetrodotoxin-coated spikes; Clyde straps Darby to a table, makes medical preparations to prolong Darby's suffering, and then video-records himself slowly dismembering Darby before eventually decapitating him. When Darby's remains are found, evidence ties his death to Clyde; Clyde willingly surrenders and goes to prison.

In prison, Clyde demands a new mattress in his cell in exchange for a "confession." Nick initially refuses, but after learning that Clyde traumatized Nick's family with the video of Darby's murder, District Attorney Jonas Cantrell orders Nick to make the deal. In court, Clyde represents himself and successfully argues he should be granted bail, but is immediately denied and jailed for contempt of court after berating the judge for accepting the legal precedent he cited, believing her too easily convinced and eager to let madmen and murderers back on the street.

After giving Nick his confession, Clyde demands an elaborate steak lunch and a music player be delivered to his cell by a specific time, in exchange for the location of Bill Reynolds, Darby's lawyer, who was reported missing. Nick agrees, though the lunch is delayed a few minutes courtesy of the warden's security measures. Once he has his meal, Clyde provides the coordinates leading to the location of the lawyer. Nick is too late to save Darby's lawyer as he suffocated inside a box due to time-mechanized materials, and immediately realized the timing it took to get from the prison to the burial site. After sharing his meal with a cellmate, Clyde proceeds to kill him with his steak bone, forcing the warden to secure him in solitary confinement.

Cantrell and Nick meet Bray, Clyde's former's CIA contact, learning Clyde previously worked with the agency, creating imaginative assassination devices and orchestrating intricate lethal tactics against nearly impossible targets. They are warned Clyde can kill anyone anytime he wishes and that if he is in jail, it is all part of a bigger plan. Bray then suggests to Nick and Cantrell that their best option was to kill Clyde. During a meeting with Nick and Cantrell, the judge is killed by an explosive hidden in her cell phone. Clyde explains to Nick that the murders are not about revenge, but the failures of the justice system. He then demands to be released and all charges against him dropped or he will "kill everyone".

Nick takes precautionary measures instead, moving his entire team into the prison to work throughout the night. After Clyde's deadline passes with nothing happening, Nick tells his team to go home and get some rest and Clyde is not omnipotent. While walking to his car with Jonas, a number of Nick's assistants are killed in car bombings. Nick watches in horror as Sarah, who is unable to escape her car, realizes what's about to happen and her car explodes. Nick meets with Clyde in private, beats him, and yells at him in frustration that, if they had tried to convict Ames and Darby, they might have gone free. Clyde counters that Nick did not care and that if he had at least tried but failed, Clyde would have accepted it. Nick demands an end to the killings, but Clyde tells him that he is just beginning to destroy the corrupt system and all who believe in it. While leaving the funeral of a colleague, Cantrell is killed by a weaponized bomb disposal robot. Nick is ready for his resignation; however, the irate mayor puts the city on lockdown and promotes Nick to acting District Attorney.

Nick learns that Clyde owns an auto garage near the prison. A tunnel leads to a cache of guns, disguises, and other equipment below the solitary confinement cells, with secret entrances to each cell. He realizes that Clyde wanted to be in solitary confinement all along; this allowed him to easily leave the prison without detection and carry out his premeditated murders while misleading the police, who assumed his murders to be accomplices' doing. Evidence points to Clyde's next target, City Hall, where the mayor is holding an emergency meeting. Nick and his men cannot find Clyde, but discover a cell-phone-activated suitcase bomb planted in the room directly below the meeting.

Clyde returns to his cell and is surprised to find Nick waiting for him. Clyde suggests another deal, but Nick, having finally come to understand him, says he no longer makes deals with murderers. Nick tries to reason with Clyde, but Clyde activates the suitcase bomb, causing Nick to leave while locking Clyde's cell behind him and Dunnegan closing off his secret passage. Hearing the ringtone of the detonator, Clyde discovers the bomb underneath his bed and realizes too late that Nick had moved the bomb to his cell. Clyde briefly smiles and returns to his bed. He pulls out and looks at his daughter's bracelet as the bomb explodes.

The epilogue shows Nick watching his daughter in a musical stage performance, an event which he previously had difficulty finding time to attend.

• Jamie Foxx as Nicholas "Nick" Rice, a Philadelphia prosecutor who later became the Assistant DA
• Gerard Butler as Clyde Shelton, an experienced engineer seeking revenge against Philadelphia's justice system after his family received no justice
• Viola Davis as April Henry, Incumbent Mayor of Philadelphia
• Bruce McGill as Jonas Cantrell, Philadelphia's District Attorney
• Leslie Bibb as Sarah Lowell, Nick's assistant
• Colm Meaney as Detective Dunnigan, a homicide detective for the Philadelphia Police Department
• Regina Hall as Kelly Rice, Nick's wife
• Michael Kelly as Bray, a CIA agent who warns Rice about Shelton
• Michael Irby as Detective Garza, Dunnigan's partner
• Roger Bart as Brian Bringham
• Christian Stolte as Clarence Darby, a psychotic mobster personally responsible for murdering Clyde's wife and daughter
• Gregory Itzin as Warden Iger, the warden of the prison Shelton was sent to
• Emerald-Angel Young as Denise Rice, Nick's daughter
• Annie Corley as Judge Laura Burch, a Philadelphia judge whose decision created ire for Shelton
• Richard Portnow as Bill Reynolds, Darby's lawyer
• Josh Stewart as Rupert Ames, a thug who assisted Darby in the home invasion

Gerard Butler was initially signed on to play the prosecuting attorney, while Jamie Foxx was the criminal mastermind operating from inside prison,[6] a reversal of their roles in the final version.

Frank Darabont was expected to direct the film, but he left production due to creative differences with the producers.[7]

Filming began in January 17, 2009 and took place in and around Philadelphia.[8] Filming locations included Philadelphia's City Hall, Laurel Hill Cemetery[9] and the now closed Holmesburg Prison. Holmesburg's "Thunderdome command center" is quite evident in the movie.

The film was edited after being threatened with an NC-17 rating for violence,[10] with the full version released unrated on Blu-ray.

The score to Law Abiding Citizen was composed by Brian Tyler, who recorded his score with a 52-piece ensemble of the Hollywood Studio Symphony at the Sony Scoring Stage with help from Kieron Charlesworth.[11] The film also uses "Eminence Front" by The Who and "Engine No. 9" by Deftones on Clyde's iPod while he is eating his steak in his cell. While Clyde calls Darby to help him 'escape' the police after Ames' execution, "Bloodline" by Slayer is Darby's ringer. The tune at the end for closing credits is "Sin's A Good Man's Brother" by Grand Funk Railroad.

The film was released theatrically on October 16, 2009 in the United States.[12] The first theatrical trailer was released on August 14, 2009, and was attached to District 9.[13]

The premiere was held on November 15, 2009, at the Cineworld complex in Glasgow, Butler's home town. Many British tabloids labeled the event as the "Homecoming Premiere", in reference to the Homecoming Scotland 2009 celebrations.[14]

In May 2022, it was announced that a standalone sequel is in development. Kurt Wimmer was hired to return in his role as screenwriter, while Gerard Butler will serve as producer alongside Alan Siegel, Lucas Foster, Rob Paris, and Mike Witherill. Foster stated in his returning role as a producer that the studios look forward to "revisit[ing] these great characters" stating that the premise "seems even more relevant today than when...the original film" released. The filmmaker stated: "We’re going to blow your mind… again." While the plot has not been revealed, Paris and Witherill jointly stated that the creatives involved, see the movie as a "franchise opportunit[y]." The project will be a joint-venture production between G-Base Productions, Rivulet Films, Warp Films, and Village Roadshow Pictures.[19]

• Vigilante film
• List of films featuring home invasions

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