As the story unfolds, Billy and Colin engage in a game of cat and mouse, each trying to uncover the other's true identity. The film's tension builds as the two men get closer to the truth, leading to a thrilling and violent confrontation.

If you prefer watching in English with Hindi subtitles, most streaming and digital purchase/rent platforms offer subtitle options.

For a detailed breakdown of the complex finale, reviewers at ScreenRant analyze the "rat" symbolism and final confrontations.

The movie is a remake of the 2002 Hong Kong film "Infernal Affairs," and it brings to the table a gripping story of undercover operations within the Boston mafia and the police department. The narrative deftly navigates through the lives of two men, Billy Costigan (Leonardo DiCaprio), an undercover cop infiltrating the Irish mafia, and Colin Sullivan (Matt Damon), a mafia mole within the police department. The parallel lives of these characters create a thrilling cat-and-mouse game, fraught with tensions and unexpected betrayals.

For factual details on the cast and storyline, the IMDb The Departed Page is a primary resource.