Dans les années 1980, René Boisrond, inspecteur en poste au commissariat du 18e arrondissement de Paris, mène une vie bien tranquille, entre sa concubine Simone, une ex-prostituée, et son travail qui consiste essentiellement à encaisser pots-de-vin et commissions occultes en tous genres, lui permettant d'assouvir sa passion pour les courses hippiques.
Undercover narcotics officer Nick Tellis (Jason Patric) chases a drug dealer through the streets of Detroit after Tellis' identity has been discovered. During the pursuit, the dealer holds a child hostage. Tellis shoots and kills the dealer before he can hurt the child, however a stray bullet hits the child's pregnant mother, causing her to miscarry.
The film begins with a sumptuous banquet at the opulent estate of the Grand Yakuza leader Sekiuchi (Soichiro Kitamura), boss of the Sanno-kai, a huge organized crime syndicate controlling the entire Kanto region, and he has invited the many Yakuza leaders under his control. After the formal conclusion of the banquet, Kato, the chief lieutenant of Sekiuchi, pulls one of the Yakuza leaders, Ikemoto, aside and makes plain that he is displeased with the news that Ikemoto has become friendly with a rival gang leader, Murase, while the two were unexpectedly imprisoned together. Kato orders Ikemoto to bring the unassociated Murase-gumi gang in line, and he immediately passes the task on to his subordinate Otomo (Beat Takeshi), who runs his own crew.
The film begins with two anti-corruption detectives observing the discovery of dead bodies in a car being recovered from the bottom of a harbor. The detectives suspect that the drowned bodies are related to the recent gang war and power struggle at the huge Sanno-kai crime syndicate, which covers a large portion of eastern Japan. The new Grand Yakuza leader of Sanno-kai, Kato (Tomokazu Miura), must now reform his standing with the powerful rival Hanabishi-kai of western Japan. Otomo (Beat Takeshi), a former Yakuza, is serving time in a maximum security prison after falling out of favor with Sekiuchi, the former Grand Yakuza before Kato murdered him and took control.
Immigration enforcement agent Smith (Jack Nicholson) lives in California with his wife (Valerie Perrine) in a trailer. She persuades him to move to a duplex in El Paso shared by her friend and border agent Cat (Harvey Keitel). She opens a charge account and starts to purchase expensive items like a water bed as she tries to build a dream home.
Chloe, a single mother living with her daughter Sophia, operates a motel. Topo is a blind man traveling cross country in a Jeep with his associate John. They stop by Chloe's motel, when John hires prostitute Gwen, and convinces Topo to stay the night. When Gwen is entertaining John, an argument has John fatally shooting Gwen, waking Chloe up. Chloe investigating finds Gwen and John dead.
Officer Dave Brown (Harrelson) has two ex-wives who are sisters (Anne Heche and Cynthia Nixon), and he cheated on both. Brown has a daughter from each marriage which creates conflict at home. Dave also has contentious relationships with his children. However, the film starts with his other home, which is the beat. Dave patrols streets occupied by gangs, and he creates problems for himself with increasing severity. Dave forcibly obtains a confession out of a convenience store thief. Later he is caught on tape beating someone almost to death. The beating is still playing on television when he's involved in a suspicious shooting. These incidents get Dave in trouble with an already beleaguered police department, and he faces either sanctions or forced retirement. Dave tries to talk his way out of trouble with an assistant district attorney (Sigourney Weaver). Dave realizes that his superiors are less concerned about what he has done but more concerned about the predicament he has created by getting caught.
The film opens in Thailand, with Antonio Serrano (Nick Mancuso), a mafia drug distributor visiting long-time associate Kinman Tau (Tzi Ma), a drug kingpin. Serrano is having troubles and wants them to work together, but his request is not reciprocated.
Comme il le souhaitait dès l'époque de sa rencontre avec René Boirond, François Lesbuche est devenu commissaire à l'IGS, là où lui et René avaient été embauchés à la fin du deuxième opus. Malgré son grade et sa volonté d'être incorruptible, il n'hésite pas à rejouer les ripoux pour aider son vieil ami René, retraité reclus sur sa péniche. Impliqué bien malgré lui dans une affaire de blanchiment d'argent, René qui a accidentellement perdu le magot qui lui avait été confié est poursuivi par les commerçants chinois de Belleville. Avec l'aide d'un ami chirurgien, Albert, René change d'identité et devient Jean Morzini, un patient de la clinique d'Albert récemment décédé. Il reçoit alors la visite d'une certaine Maud qui lui remet les instructions pour le casse d'une banque que Morzini avait prévu de cambrioler ; et de la fille du vrai Morzini, Marie, qui n'avait jamais vu son père et croit que c'est René. Simultanément, François prend sous sa tutelle un jeune stagiaire, Julien, filleul de son patron, qui s'éprend de Marie.
François et René forment une équipe de ripoux depuis déjà 5 ans quand François, qui envisage de passer l'examen de commissaire, souhaite redevenir honnête. Mais lorsqu'il remet à une boutiquière volée l'argent dérobé, celle-ci, en raison d'une vieille rancune envers René, les accuse aussitôt du forfait. Les deux flics sont alors suspendus et remplacés par les inspecteurs Brisson et Portal, censés être de véritables modèles d'intégrité. Mais les apparences sont trompeuses.
Working as a uniformed patrolman, Frank Serpico excels at every assignment. He moves on to plainclothes assignments, where he slowly discovers a hidden world of corruption and graft among his own colleagues. After witnessing cops commit violence, take payoffs, and other forms of police corruption, Serpico decides to expose what he has seen, but is harassed and threatened by his peers. His struggle leads to infighting within the police force, problems in his personal relationships, and his life being threatened. Finally, after being shot in the face during a drug bust on February 3, 1971, he testifies before the Knapp Commission, a government inquiry into NYPD police corruption between 1970 and 1972. After receiving a New York City Police Department Medal of Honor and a disability pension, Serpico resigns from the force and moves to Switzerland.
Singham opens with an honest police officer in Goa, Rakesh Kadam (Sudhanshu Pandey), committing suicide because of false accusations of corruption by Jaikant Shikre (Prakash Raj), a don and politician in Goa running a kidnapping racket. Kadam's wife Megha Kadam (Sonali Kulkarni) vows revenge.
The film follows a day in the life of Los Angeles Police Department officer, Jake Hoyt, who is scheduled to be evaluated by Detective Alonzo Harris, a highly decorated LAPD narcotics officer. In Alonzo's car, the officer sees teenage Mara Salvatrucha gang members dealing drugs in a park. Alonzo confiscates the drugs and tells Jake to take a hit of the marijuana. Jake refuses, but Alonzo puts a gun to his head and says that Jake's failure to use drugs could get him killed by a street dealer.
Captain Roberto Nascimento (Wagner Moura) narrates the film, briefly explaining how the police and the drug lords of Rio de Janeiro cooperate with each other (policemen collect periodic bribes and drug lords are left free to operate) in the 90's.
A sa sortie de prison, Sam tente de se réinsérer mais il est vite rattrapé par le milieu et sombre peu à peu dans un engrenage criminel. A travers les yeux de son fils, il perçoit une lueur d'espoir.