Henry Brogan (Will Smith), a special agent working for the U.S. Defense Intelligence Agency, is a top sniper. During his career, he has been ordered to eliminate many terrorists who threaten national security. He was decisive and unhesitating when performing his mission. However, the last mission almost failed, which made him waver and proposed to return to the countryside. However, he put down his butcher knife and accidentally heard a major event about state secrets, which immediately led to murder. After escaping the government's first encirclement and suppression, he fled with the female agent Dani (Mary Elizabeth Winstead), who was accidentally involved in the surveillance of himself, and defected to his former comrade Barron (Benedict Wong). I never thought that the new killer would linger and follow. What surprised Henry even more was that the one chasing him was another 25-year-old himself...