职业杀手诺克斯，某日得知自己罹患比阿兹海默症更为严重的稀有疾病“库贾氏病”，他的记忆将在几周内全数消逝。这让他决议跟同伴汤米执行杀手生涯的最后一次义务，没想到汤米却在途中不测身亡。诺克斯试图清算立功现场，并在警察抵达前先行分开。不料返家之后，等候他的却是关系疏远、久未联络的儿子迈尔斯。迈尔斯浑身是血地向诺克斯解释自己在与损伤女儿的凶手对峙时，失手杀了对方，希望父亲可以帮他掩盖罪行…。面对逐渐迫

A contract killer who was diagnosed with a fast-moving form of dementia has an opportunity to redeem himself by saving the life of his estranged adult son.