检查官莫妮卡·坎贝尔让犯罪特侦处保护一位关键证人。莫妮卡被杀后，她的同事莎拉要求犯罪特侦处立案调查。

被推定死亡的罪犯在犯罪特侦处里大开杀戒。詹姆斯和莎拉前往乡下追捕。

经历一场个人悲剧后，犯罪特侦处探员哈利·克莱顿接下萊夫企业的一份工作。犯罪特侦处小队的行动受到了监视。

前往废弃监狱调查格林的过往时，艾迪了解到其他神秘死亡事件。克莱顿四处寻找一份失踪的样本。

席欧看自己的面具抵御了攻击。艾迪试图跟踪席欧。詹姆斯在人群中看到了克莱顿。

詹姆斯成功地保护了席欧的家人。在城市的另一端，克莱顿尾随席欧和艾迪前往犯罪特侦处办公室。

莎拉在医院里想起案件的关键细节。艾迪努力应对攻击的余波。史蒂芬·马特兰举行会议

莎拉确认对象身份后，詹姆斯破门闯进宅邸。克莱顿见到了面具计划的负责人。

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詹姆斯带着佛瑞德的狗前往康纳的公寓。在实验室里，康纳向克莱顿展示了一件事物。莎拉向艾迪说出了自己的怀疑。

莎拉与一名调查莱夫企业的记者交换意见。詹姆斯仍在康纳公寓里，并面临另一波攻击者。

得知长官的过往后，莎拉想出他与莫妮卡以及莱夫企业之间的潜在联系。她随后联系了艾迪。

犯罪特侦处试图把佛瑞德从大厦里带出来，却遭遇四人组拦截。审视事态发展的克莱顿和康纳决定插手干预。

克莱顿直面剩余刺客中的一人，詹姆斯出手相助。盖格勒和他的长官在佛瑞德的手术区内待命。

马特兰被捕并接受审问，这让理查想起当初让他走上莱夫企业这条路的事件 。莎拉觉决心要为莫妮卡伸张正义。

The SSC's new director has his own ideas about how to operate the organisation. Eddy's research turns up a lead: former scientist William Herst

Connor and Creighton break into Herst's house to get ot Tina. William fails to hold them off, but James and Wyatt show up to confront the intruders

Harry leads a team into assaulting the supposedly secure SSC safe house where James and Tina are holed up. Somehow, SSC must have been compromised.

While on the run from the SSC, James and Tina are deliberately hit by a truck. Looking for answers, James makes contact with Anna Winehouse.

With Eddy's help, James tries to infiltrate the site where Tina is being held. Connor tells Tina about her family's involvement with the masks.

James hands Connor over to Wyatt. In custody, Connor maintains his silence until Anna asks to question him herself.

Anna tells Tina about the research that proceeded her birth. William Herst regains consciousness. Coates meets with a mysterious individual.

Waiting for her father, Tina looks at Anna's old pictures of her parents. Wyatt and Eddy work together to find Gary Evans and stumble into an ambush.

Coates puts out a warrant on Evans. James, Anna, Tina and Herst try to escape the hospital via helicopter, but Connor is already inside.