A listless grand-daughter, Chance Sinclair (Avery Konrad), is sentenced to live with her draconian grand-father, August (Timothy V. Murphy) after a violent incident at school and begins to question the source of her families immense wealth and power. When Chance's scheming Mom, June (Annette Reilly), hires a troubled chef, Sydney (Johnathan Lipnicki), to poison August, the family's monstrous secrets are revealed over the course of one bloody night. Every soul is up for grabs as The Sinclair Family Games Night gets underway and Chance learns that being apart of this family is a blood-in, blood-out proposition.

故事发生于位于西雅图的霹雳小组训练中心内，艾伦（阿德琳妮·帕里奇 Adrianne Palicki 饰）、沃德（泰·奥尔森 Ty Olsson 饰）和霍尔（山姆·贾格 Sam Jaeger 饰）是其中的骨干成员。一天，小组接到线报，说在一家废弃的货运中心里正在进行毒品交易，小组随即展开了行动，果然将交易场面撞了个正着。激烈的枪战平息后，组员们在集装箱内发现了一名被绑住的男子，男子名叫蝎子（迈克尔·加·怀特 Michael Jai White 饰），他的胳膊上植入了一枚芯片，芯片里记载了帮派所有的犯罪证据。 　　蝎子成为了霹雳小组最重要的证人，黑帮当然也不会对此坐视不管，他们派出了各路杀手对训练中心进行了猛烈袭击。