空有雄心壮志的魏文帝曹丕（李晨 饰），以四十岁的年纪遽然离世。其子曹叡（刘欢 饰）即位，却因母亲甄宓的缘故而对父皇以及郭太后（唐艺昕 饰）心存怨恨。朝廷之上，作为托孤重臣的曹真、曹休极力排挤奉诏回都的司马懿（吴秀波 饰），意图壮大宗族的势力。魏国之外，孙权阳奉阴违，虎视 江东。蜀汉则在丞相诸葛亮（王洛勇 饰）的主持下有条不紊推进着北伐大业。在这一过程中，惯于隐忍的司马懿蓄势发力，逐渐在庙堂之争中占据主动，两个儿子司马师（肖顺尧 饰）和司马昭（檀健次 饰）更成为他完全信赖的左膀右臂。他耗走了魏明帝，耗走了诸葛亮，渴望从别人手中的刀变成执刀之人，却似乎始终没能逃脱命运的追赶。
白发苍苍的古稀之年，司马懿是否意识到自己早离当年的初衷相去甚远……
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