"Lucky Number Slevin" revolves around a case of mistaken identity that leads the protagonist, Slevin, into a web of crime and revenge. The title refers to the concept of the "number seven" being considered lucky in various cultures, which mirrors Slevin's journey from misfortune to a fate that ultimately hinges on chance and luck. Throughout the film, themes of fate, coincidence, and the unpredictability of life are explored, with Slevin's character embodying the struggle to find fortune amidst chaos.

"Lucky Number Slevin" is worth watching if you enjoy clever twists and dark humor in a neo-noir setting. The film features a strong cast, including Josh Hartnett, Bruce Willis, and Morgan Freeman, and is known for its intricate plot and stylish direction by Paul McGuigan. The story revolves around mistaken identity and revenge, with plenty of suspense and a unique narrative structure. While opinions on the film can vary, many viewers appreciate its blend of thriller and comedy, making it a memorable experience for fans of the genre.

"Lucky Number Slevin" is rated R primarily for its strong violence, including intense and graphic scenes of crime-related brutality. The film also contains frequent profanity, which contributes to its mature rating. Additionally, there are elements of sexual content and drug use that further warrant the R classification. These factors make the film suitable for adult audiences, as it explores dark themes involving organized crime and revenge.

In "Lucky Number Slevin," the main character, Slevin Kelevra, played by Josh Hartnett, is mistakenly identified as Nick Fisher, a man with a huge gambling debt. As a result, he becomes embroiled in a deadly conflict between two rival crime bosses, the Rabbi and the Boss. Throughout the film, Slevin uncovers a complex web of deception, ultimately revealing that Nick Fisher was actually murdered, and Slevin was seeking revenge for his friend. The plot culminates in a twist where Slevin orchestrates a clever plan to eliminate both crime bosses.