Gemini Man

Henry Brogan, an aging government assassin, is sent on a mission to assassinate an anonymous terrorist aboard a bullet train. During the mission, Henry's spotter warns him of a young girl approaching the target, causing Henry to delay his shot until the last second, shooting the man in the neck despite aiming for his head. Disillusioned with killing, Henry retires from government service.

While adjusting to retirement, Henry meets boat rental manager Dani and reconnects with an old friend, Jack, who reveals that an informant named Yuri told him that the man Henry killed was innocent; demanding proof, Henry has Jack arrange a meeting with Yuri. In retaliation for Henry knowing their deception, agency director Lassiter plans to kill him; Clay Varris, head of a top-secret black ops unit codenamed "GEMINI", request permission to eliminate him but is denied.