The film follows John Wick, a retired hitman who has lost his wife to cancer. As a gift, she had left him a final present - a Beagle puppy named Daisy. However, his peaceful life is short-lived as a group of thugs, led by Iosef Tarasov (Alfie Allen), break into his home, kill his dog, and steal his vintage Mustang. Unbeknownst to Iosef, John Wick is not a man to be trifled with. He sets out on a mission of revenge, taking on the entire Russian mafia and its ruthless leader, Viggo Tarasov (Michael Nyqvist).