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The story is set in South Boston in the late 1970s. James "Whitey" Bulger (Johnny Depp) is the leader of the Winter Hill Gang, a local criminal group with ambitions to control the entire district. A golden opportunity to expand his criminal empire arrives when an ambitious FBI agent and childhood friend, John Connolly (Joel Edgerton), offers him a secret alliance. Connolly persuades Bulger to become an informant for the FBI to take down their common enemy: the Italian Mafia (Cosa Nostra), which is currently dominating Boston.
This conspiracy succeeds, but it breeds a monster that is far more dangerous. Utilizing his status as a valuable FBI asset and systematically protected by Connolly, Bulger gains absolute legal immunity. While the FBI believes they are controlling the situation, Bulger exploits the loopholes to expand his drug trafficking, extortion, and even perpetrate a string of brutal murders in broad daylight without ever being touched by the law. Meanwhile, Whitey’s biological brother, Billy Bulger (Benedict Cumberbatch), navigates the political landscape as a Massachusetts State Senator, creating a profound irony where one family controls Boston from opposite poles of power: the legislature and the criminal underworld.
The absolute success of Black Mass hinges on the magnetic and terrifying performance of Johnny Depp. With the aid of incredible prosthetics—a thinning, slicked-back hairline, pale skin, and a pair of piercing, cold blue contact lenses—Depp completely erases any visual trace of his usual self. He portrays Bulger not as a charismatic villain in the vein of Goodfellas, but as a calm, calculating predator who explodes instantly at the slightest hint of betrayal. Joel Edgerton also shines brilliantly as Connolly, showcasing the moral degradation of a federal agent who is slowly co-opted by the dark allure of the criminal underworld until his integrity is entirely lost.
Aesthetically and directorially, Scott Cooper successfully breathes life into the 70s and 80s Boston atmosphere with a style that is highly authentic, bleak, and uncompromising. The cinematography by Masanobu Takayanagi captures the city with a cold, gray palette and minimal lighting, mirroring the slow erosion of morality across the narrative. Cooper refuses to glamorize the violence; each murder scene is executed in a brutal, sudden, and deeply intimate manner, delivering a genuine psychological shock to the audience.
The audio score, composed by Tom Holkenborg (Junkie XL), contributes significantly to building a constant tension throughout the film. The soundtrack steers away from his usual loud electronic arrangements, shifting instead to slow, heavy string symphonies and dark piano chords. This music acts as the somber heartbeat of the narrative, amplifying the atmosphere of paranoia and danger that constantly lurks in every corner of the room whenever Bulger speaks.
However, a narrative structure heavily focused on historical chronology proves to be a double-edged sword that causes Black Mass to lose momentum in certain sections for some viewers. The screenplay by Mark Mallouk and Jez Butterworth feels somewhat episodic and linear, moving from one crime to the next without providing enough psychological depth as to why the supporting characters around Bulger remain so loyal or helpless against him. A runtime crowded with so many secondary characters leaves talented actors like Kevin Bacon and Corey Stoll without enough room to fully develop.
Overall, if you are looking for a gangster film filled with romanticized criminal lifestyles, thrilling car chases, or entertaining black humor, Black Mass may feel too cold, heavy, and depressing. Conversely, if you want to witness one of the best and most terrifying acting performances in Johnny Depp's career, appreciate a realistic study of a criminal character, and are interested in a true story about how the legal system can be manipulated from within, this film is a solid, gripping, and deeply powerful biographical crime drama masterpiece.