The film takes place in a world where hitmen and assassins operate in a secret society. John Wick (Keanu Reeves) has retired from his violent past and is trying to live a quiet life. However, his life is turned upside down when 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, the dog was a gift from John's wife, Helen (Bridget Moynahan), who had recently passed away.