The Equalizer (2014)

Robert McCall (Denzel Washington) is a retired black ops government operative who lives in Boston, Massachusetts and works at a Home Mart hardware store. McCall has promised to his recently-deceased wife that he'd leave his old life behind, but is compelled to act when Teri (Chloë Grace Moretz), a young prostitute he had befriended, is hospitalized after being brutally beaten by her pimp, Slavi (David Meunier). McCall tries to convince Slavi to release Teri by paying him, but Slavi refuses and McCall kills him, unaware he's a member of the Russian mafia. In retaliation, Vladimir Pushkin (Vladimir Kulich), sends his enforcer, Teddy (Marton Csokas), to Boston to eliminate McCall. After evading several assassination attempts, McCall visits fellow retired operatives Brian Plummer (Bill Pullman) and Susan Plummer (Melissa Leo) in Virginia, who help him acquire intelligence on Pushkin's activities. McCall then captures Frank Masters (David Harbour), a corrupt Bostonian policeman who has been aiding Teddy, and forces him to help in his efforts to sabotage Pushkin's operations in Boston.

In retaliation for McCall's attacks, Teddy and his men attack Home Mart and take McCall's friends hostage to lure him out, threatening to kill them if he does not surrender. Having anticipated that, McCall booby-traps the entire store, and discretely kills off Teddy's men one by one before finally killing Teddy himself, by shooting him in his throat with a nail gun. McCall then travels to Moscow, Russia and kills Pushkin and his men before returning to Boston, where he reunites with Teri, who has recovered from her wounds and thanks him for giving her a second chance. McCall is inspired to continue using his skills to help people in desperate need and puts an online ad, identifying himself as "The Equalizer". He soon receives another plea for help and sets off to answer it.