Jack Leiche () is a product of the Cold War legacy, he worked for the US military services and special services, get a lot of awards. After leaving the army, Jack Recher almost became a ronin, because no one told him where he was going, and he was accustomed to an ordered life in the army. The story of the film begins in an ordinary small town. In a calm morning, five people live as usual, but are randomly shot and killed. All the evidence points to a man: God quasi marksmanship sniper James Barr (), he was formerly a soldier, trained snipers. He was quickly arrested and detained. After a long interrogation, there was still nothing to ask. The prisoner only made a mysterious request and wrote: "Give me Jack".
Who is Jack? This question is puzzling. Everyone couldn't even find out whether he was still alive, but Jack came to the door by himself. Jack Recher has a mysterious style and is used to being alone, and he knows the gunman. The news of random homicides prompted him to show up and tell the police the true face of the gunman. In view of the painful experience, Jack believes that this time, the police can definitely bring the killer to justice. Before Jack arrived, the prisoner was beaten up and fell into a coma. Defense attorney () have a lot of questions about Jake: Jake her client and what is the relationship? Why does the client ask to see someone who believes he is guilty? Although she was very upset, she still respected the client's request and hired Jack as her chief agent.
At first glance, the police are very efficient in handling cases, thoroughly investigating the crime scene, and successfully arresting the killer, but Jack is suspicious of the perfect crime. Jack doesn't rely on people in everything, and with his keen observation, he discovers the subtleties that others have overlooked. The deeper the investigation, the more I feel that things are not simple. So he started to investigate the truth, it turned out that the facts were not as they were on the surface, and family members may also be enemies. Jack is both civil and military, and nothing can escape his eyes. Although he is a lone ranger and has his own principles, he still has a strong sense of justice in his heart. Jack discovers that he is facing a cunning enemy, this unexpected enemy loves violence, and hides secrets, and even kills to keep secrets. Jack must make good use of tactics in order to anticipate and deceive the enemy, protect the innocent suspect, and uncover the real murderer.
