在经历了上一次的恐怖袭击之后，由于政府对CTU应对恐怖事件的解决方式不太满意，还是最终决定解散CTU。杰克·鲍尔（基弗·萨瑟兰 Kiefer Sutherland 饰）也因使用酷刑等非法手段来防止恐怖袭击，而受到审查。原本以为自己终将在监狱里度过余生，却因死而复生的前同事托尼（卡洛斯·博纳德 Carlos Bernard 饰）的出现，彻底打乱了杰克现有的生活。托尼希望杰克能与他一起，共同调查又一次在美国大路上展开的恐怖袭击。而随着调查的不断深入，杰克觉得身边的托尼越来越琢磨不透。杰克一直觉得托尼有什么事情没有对他说明白。由于新总统对杰克的信任，所以他们的调查之路虽然危机重重，但是开展得还算顺利。不过，最后杰克终于发现这次恐怖袭击的幕后策划者，原来是一直与他并肩作战的朋友托尼……收起
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