After John Wick loses his better half Helen to a terminal ailment, he gets a puppy named Daisy, per Helen's guidelines, to help him adapt to her demise. He associates with the puppy and they spend their day driving around in his vintage 1969 Ford Mustang Mach 1. At a service station, he experiences a trio of Russian criminals whose pioneer, Iosef Tarasov, demands purchasing his auto, however John declines to offer it. The mobsters take after John to his home that night, thump him oblivious, take his auto, and slaughter Daisy. Iosef takes the Mustang to a cleave shop keep running by Aurelio to have the VIN changed.

Aurelio perceives the auto and, after discovering that Iosef stole it from John, punches him before tossing him out of his shop. John visits Aurelio, who reveals to him Iosef is the child of Viggo Tarasov, the leader of the Russian wrongdoing syndicate in New York City. Viggo, educated by Aurelio of Iosef's activities, beats and castigates Iosef, disclosing to him that John Wick was his best professional killer, nicknamed 'the Boogeyman. ' When John needed to resign and wed Helen, Viggo gave him a 'unimaginable undertaking': executing the greater part of his rivals in a solitary night.

John succeeded, building up the Tarasov syndicate. Viggo tries to talk John out of looking for reprisal, however John quietly won't. Viggo then sends a twelve-man hit squad to John's home, yet John executes them all and has the bodies professionally expelled. An unsurprised Viggo places a $2 million abundance on John's head and by and by offers the agreement to Marcus, John's tutor. John looks for shelter at the Continental Hotel, which cooks solely to the criminal black market and allows no 'business' on its premises. Viggo duplicates the abundance for those eager to break the principles to slaughter John at the Continental.

John gains from Winston, the Continental's proprietor, that Viggo has Iosef secured at his club, the Red Circle. John enters the Red Circle and murders his approach to Iosef, however Iosef get away. John retreats to the Continental to treat his injuries. Ms. Perkins, a professional killer and previous colleague of John's, sneaks into John's space to slaughter him, yet Marcus cautions John. John stifles Perkins after a merciless hand-to-hand battle and constrains her to uncover the area of Viggo's front. John thumps Perkins oblivious and abandons her with kindred professional killer Harry to anticipate discipline.

In any case, Perkins liberates herself and murders Harry. John goes to the Little Russia church which fills in as Viggo's front and crushes Viggo's reserve of cash and extortion material. Whenever Viggo and his group arrive, John ambushes them, yet he is along these lines caught. Viggo insults John for supposing he could desert his previous lifestyle. Marcus mediates, permitting John to free himself and hail Viggo. At gunpoint, John strengths Viggo to uncover Iosef's area. John then goes to Iosef's 'sheltered house' and murders him. Perkins sees that John and Marcus have been in contact and tells Viggo, who has Marcus tormented and executed in his home. Viggo calls John to report the slaughtering, wanting to have Perkins trap John.

Perkins, in any case, is assembled to a conference with Winston, who has her executed for breaking the Continental's tenets. Winston calls John to advise him that Viggo is wanting to escape by helicopter, and John races to the harbor, slaughtering Viggo's residual thugs before drawing in Viggo in a fistfight on the dock. Viggo pulls a blade and John permits himself to be cut, shocking Viggo. John then incapacitates and lethally wounds Viggo. Injured himself, John stops at a waterfront creature center to treat his injury and brings with him a pitbull puppy which was booked to be euthanized. John and the puppy walk home on the promenade where he had his last date with Helen.