In a near future, crimes and accidents can be prevented by making just one phone call to the past. However, the peace of this utopian world will be disrupted by a methodical killer who seems to have discovered the only flaw in this system.。2008年,在阿拉巴马州的猎鹿人被谋杀。现场只有他的步枪,血液和一个数字“16”留下……没有人知道究竟发生了什么,而案件并未结束,五年后,他的儿子为了替父亲报仇,踏上了寻找真相的道路。。