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A group of aliens has come to Earth to learn about its population, customs, etc. To avoid detection, they have taken on human form which gives them human emotions, physical needs etc. WITHOUT the understanding of what they mean or the inhibitions normally present in humans. Their leader takes the position of a college professor, their military expert as his sister, their intell...。寂寞的都市夜，电台DJ西蒙（雷宇扬 饰）时常接到听友Cat（甄子丹 饰）打来电话倾诉衷肠，Cat挂线，拿起枪变为冷血杀手，他冲入一幢大楼，将目标人物和保镖们全部击杀。女警Carrie（吴辰君 饰）所在的小组接手此案，每日收听同一档节目并且对Cat的声音颇为熟悉的Carrie并不知道，Cat的形象早已出现在她的脑海…… Cat在执行新任务时偶遇故交Wesley（黄家诺 饰），原来两人曾同为美国警察，Cat因Wesley的背叛失去了一切，沦入不能回头的杀手生涯。Cat误会Carrie是Wesley女友，将其带走，向她袒露了自己的孤独与绝望，二人在天台山跳了一支寂寞的舞。不久Wesley挟持Carrie闺蜜要挟，Cat决定为Carrie孤身犯险。。