The film is based on the novel "The Perfect Suspect" by Richard, the "King of British Thrillers". Six bullets, five deaths, and a mysterious gunman committed a tragedy in the downtown area that plunged the entire city into panic. All the evidence points to former military sniper James Barr (Joseph Sikora). But he insists on his innocence and asks to find his old acquaintance Jack Richard (Tom Cruise), who served in the army together. As Jack's investigation deepens, he discovers a bigger mystery. The real murderer who concocted this tragedy seems to be someone else, and the behind-the-scenes mastermind with ulterior motives has captured Barr, leaving Jack alone to find out the truth. One of the six bullets was a bullet that was deliberately fired by the killer. In order to understand the work of the sniper, Jack came to the sniper's training camp and found a coach named Samuel Cash (Robert Duvall). With the help of Cash, Barr's sister and a lawyer, Jack gradually walked into the center of the incident, and a secret about the Soviet transformation camp and the Russian mafia slowly surfaced...