Former Marine and Defense Intelligence Agency spy Robert McCall now lives in a diverse apartment complex in urban Massachusetts. He is working as a Lyft driver and assists the less fortunate with the help of his close friend and former DIA colleague, Susan Plummer. McCall anonymously travels to Istanbul by train to retrieve a local bookstore owner's daughter who was kidnapped by her father. He also helps Sam Rubinstein, an elderly Holocaust survivor who is looking for a painting of his sister; the two siblings were separated when they were transported to different camps by the Nazis, but the painting is found to be auctioned off and Sam cannot prove that he owns it. After discovering that the apartment courtyard has been vandalised, McCall accepts an offer from Miles Whittaker, a young resident with an artistic but troubled background, to repaint the walls. At some point, McCall rescues Miles who had been lured away by a gang to commit crimes for them.

One day, Susan and DIA operative Dave York, McCall's former teammate, are called to investigate the apparent murder-suicide of an agency affiliate and his wife in Brussels. When the two separate after reaching their hotel, Susan is accosted and killed in an apparent robbery by two men with backpacks who got off the elevator on her floor. When he receives the news, McCall begins to investigate both her death and the case she was working on. After reviewing elevator CCTV footage, McCall determines that while Susan could have been simply the victim of a robbery, as the official account concluded, the suspects' foreknowledge of her specific floor and the expertly-delivered fatal stab wound suggest that she was specifically targeted. He also confirms that the incident into which Susan was looking was merely staged to look like a murder-suicide, and that Susan's death is probably connected to it. McCall makes contact with York, who had thought him dead for years, and informs York of his findings.

During one of his shifts driving, McCall is attacked by a man posing as a passenger. McCall kills the assailant and retrieves his phone. McCall discovers that his former partner, York, was on the phone's call list. He visits York at his home and confronts him, where York admits that he's now a mercenary after feeling used and discarded by the government. York further divulges that he himself finished Susan off (his two hired assailants failed to eliminate her), as she would have figured out that he was behind the Brussels killing. McCall leaves the house where York's three teammates â?? Kovac, Ari, and Resnik â?? are arriving across the street. McCall promises to kill the entire team before escaping safely by getting a ride from York's unsuspecting wife and children.

Resnik and Ari head to Susan's house to kill her husband Brian, but McCall evacuates Brian first. York and Kovac break into McCall's apartment, where Miles is starting another paint job he had proposed to McCall. Monitoring via webcams, McCall instructs Miles to hide in a hidden passage concealed behind a book case; when York seems to close in on the passage's two-way mirror, McCall phones him to taunt him. Miles emerges from hiding shortly after York and Kovac seem to leave, but is captured as he opens the apartment's front door.

Per his taunts to York, McCall returns to his seaside hometownâ??now evacuated as a hurricane approachesâ??and readies himself for York and his team. Kovac, Ari, and Resnik arrive and begin searching the town in gale-force winds, as York situates himself on the town's watchtower in a sniper's position. Kovac enters a tackle shop and is killed with a harpoon gun. When Ari heads toward the seaside, he is disturbed by pictures of Susan that he sees along the way; catching him off guard, McCall butchers him with a knife, leaving him mortally wounded. McCall then enters his late wife's old bakery to lure in Resnik, who is fatally eviscerated in a flour explosion set off by his own stun grenade. Enraged, York reveals that he has Miles tied up in the trunk of his car and begins shooting at it to lure McCall out, but he runs out of bullets after McCall foils his last shot. With the storm growing heavier, York is knocked down by a gust of wind before being confronted by McCall atop the tower. McCall gets the upper hand, kills York with a knife (stabbing him in the same spot he stabbed Susan), and tosses him onto the rocks below, where the ocean promptly washes away his body.

Back in Massachusetts, Susan's information about Sam's sister's painting helps McCall to reunite Sam with his long-lost sister. Miles finishes repainting the apartment complex, returns to school and focuses on his art. Having moved back into his old house, McCall looks out towards the calm sea.

https://en.wikipedia.org/wiki/The_Equalizer_2
asuna