新年前夜，神秘杀手在美国市中心的一栋高层，大规模远程枪杀狂欢的人群。29人死亡，枪枪毙命，案发现场找不到任何弹壳、指纹等证物，杀手毫无踪迹。三天后，杀手又在大型购物中心大开杀戒，数十位市民和安保人员中弹身亡，一组特警队员也被杀手用手榴弹团灭。　　联邦调查局长官兰马克（本·门德尔森 Ben Mendelsohn 饰）和其爱徒——年轻女警艾丽诺（谢琳·伍德蕾 Shailene Woodley 饰），奉命查案，但州政府、当地警局都妄图夺取功劳，争权夺利，甚至执行兰马克强烈反对的特警行动，但这些行动造成的市民伤亡却又归咎于兰马克，无比荒谬，完全失控。也正是这个荒谬的恶世，塑造了今日的杀手。师徒二人在走投无路之际，艾丽诺发现了关键线索，带她无限接近恶世深渊之中。

Zoey, a cyber crime cop, and Barry, a detective, raise their son, Timmy, in a quiet suburban neighborhood. When Zoey confides in her best friend about shift work and the lack of spark in her marriage. Zoey's mind is set in motion and when she discovers Barry is screwing around, she calls him out. Willing to give him a second chance, Zoey tries to mend her marriage. When Barry is seen again with "that" woman, Zoey gets a restraining order and sole custody of Timmy. Late one night a fire in her home tragically takes the life of her son. The evidence points to Zoey taking sleeping pills and smoking - she's charged with Timmy's murder. Zoey goes to Barry for help but he's distant and blames her. Zoey fights back, convinced she was set up to take the blame for Timmy's death. As she fights to prove her own innocence she gets the biggest shock of all! Written by Anonymous.