李沧东是刑事情报科的一位督查，当年的一次行动中，李沧东为了抓捕犯人无奈牺牲了线人，线人因为身份暴露身中数刀沦为疯子，这让李沧东虽然立功晋升，但是心里一直愧疚不已
一年后，警方收到消息，巴闭这个劫金大盗准备回到香港作案，李沧东的上司让他安排线人，李沧东找到了即将出狱的细鬼，细鬼为了筹钱救自己的妹妹，答应了李沧东的安排。细鬼经过李沧东的配合下很快获得了巴闭一行人的信任，更是与巴闭女友阿弟一起物色金店和枪支。李沧东认为现在已经可以收网了，但是上司却想要抓个现行，让巴闭入狱立功。在上司的压力之下终于让巴闭抢劫了金店，随后细鬼把位置告诉李沧东，警方成功抓捕巴闭。巴闭打劫的时候毁掉了所有物证，上司想要让细鬼出庭作证，但是巴闭的同党还有在外逃窜的，如果细鬼出庭必死无疑。
Li Cangdong is a supervisor of the Criminal Intelligence Division. His identity was exposed and he was stabbed several times and became a lunatic. Although Li Cangdong made meritorious service and was promoted, he felt guilty all the time
A year later, the police received news that the robbery, Bakuan, was going to return to Hong Kong to commit crimes. Li Cangdong’s boss asked him to arrange The informant, Li Cangdong found Xigui who was about to be released from prison, and Xigui agreed to Li Cangdong's arrangement in order to raise money to save his sister. With the cooperation of Li Cangdong, Xigui quickly gained the trust of Bakuan and his party, and even searched for gold shops and guns with Bakuan's girlfriend, brother. Li Cangdong thinks that the net can be closed now, but his boss wants to catch the current situation and make Bakuan go to jail for meritorious service. Under the pressure of his boss, Bakuan was finally allowed to rob the gold store, and then Xigui told Li Cangdong the location, and the police successfully arrested Bakuan. Bakuan destroyed all the physical evidence during the robbery, and the boss wanted Xigui to testify in court, but Bakuan's accomplices still fled outside, and if Xigui appeared in court, he would surely die.
紧凑刺激的剧情：《线人》的剧情紧凑而扣人心弦。故事以谢霆锋饰演的线人身份展开，通过他与警方和黑帮之间的危险斗争，触发了一系列惊心动魄的场景。紧张的节奏和扣人心弦的剧情转折使观众无法预测下一步的发展，充满了悬念和惊喜。
强大的演技阵容：谢霆锋、张家辉和桂纶镁的出色表演为电影增添了许多亮点。他们通过精湛的演技赋予角色深度和复杂性，每个角色都有自己的故事和动机，使观众能够更好地理解和共情。他们的对手戏紧张刺激，让人难以转移目光。
精彩的动作场面：作为一部动作片，《线人》提供了精彩绝伦的动作场面。电影运用了出色的拍摄技巧和特效，呈现了令人惊叹的打斗和追逐场景。动作场面的紧凑节奏和精心设计的动作动作序列充满了张力和视觉冲击力，带给观众刺激和享受。
综上所述，《线人》是一部紧凑刺激、演技出众和动作精彩的电影。它成功地将紧张的剧情、精彩的演技和令人难忘的动作场面相结合，为观众带来了一场精彩的电影体验。
