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 Remake of the popular 2002 Hong Kong crime thriller Infernal Affairs by Andrew Lau and Siu Fai Mak, the film's screenplay was adapted by William Monahan from the original script written by Felix Chong and Siu Fai Mak.

This film takes place in Boston, Massachusetts, where Irish mob boss Frank Costello (Nicholson) implants Colin Sullivan (Damon) as an informant within the Massachusetts State Police. Simultaneously, the police assign Billy Costigan (DiCaprio) to infiltrate Costello's crew. When both sides of the law realize the situation, the two men are dispatched to discover each other's identities.