Four days after enduring previous causalities, former assassin John Wick finds his stolen 1969 Ford Mustang Mach 1 at a chop shop owned by Abram Tarasov, brother of Viggo and uncle of Iosef. John dispatches Tarasov’s men in a violent rampage that heavily damages the Mustang. He then spares Tarasov under the auspices of peace, and returns home.
After Aurelio takes John’s Mustang for repairs, John is visited by Italian crime lord Santino D’Antonio. It is revealed that to complete his “impossible task”—which allowed him to retire and marry Helen—John asked Santino for help. As a form of contract, Santino swore John to a “Marker,” an unbreakable promise symbolized by a “blood oath” medallion. Santino presents the medallion to demand services from John, but John declines, claiming that he is retired. In retaliation, Santino destroys John’s house with a grenade launcher.
Winston, the owner of the Continental hotel in New York City, reminds John that if he rejects the Marker, he will be violating one of the two unbreakable rules of the underworld: no killing on Continental grounds and Markers must be honored. John accepts his commitment and meets with Santino, who tasks him with assassinating his sister Gianna, so he can claim her seat on the “High Table,” a council of high-level crime lords. Santino sends Ares, his mute personal bodyguard, to look over John.
In Rome, John infiltrates Gianna’s coronation party and confronts her. Faced with certain death, Gianna commits suicide by slitting her wrists. After she dies, John shoots her to make sure that she is dead, therefore fulfilling his commitment to Santino. John is then ambushed by Santino’s henchmen, who intend to “tie up loose ends” by killing him. After killing most of the henchmen, John is pursued by Gianna’s bodyguard, Cassian. Their battle is halted when they crash into the reception area of the Rome Continental, which—like the New York Continental—prohibits any “business” on its grounds. As the two share a tense drink, Cassian vows revenge for Gianna’s death.