在一次反恐行动中，由于情报失误，英国特警部队误杀了一名怀抱孩子的中东移民，负责行动队的首长决定将这宗丑闻彻底抹去，遂找来了知道真相的队员们统一口径，录制假口供。刑侦队长史蒂夫（马丁·康普斯顿 Martin Compston 饰）对于首长的决定十分不满，于是辞去了职务，被调往隶属于英国反贪署的秘密行动组。 史蒂夫的任务是调查一位名为托尼（连尼·詹姆斯 Lennie James 饰）的侦缉总督察，他因为涉嫌贪污而被列入了监视的名单。史蒂夫和女警探凯特（薇琪·麦克卢尔 Vicky McClure 饰）一同打入了托尼所领导的小组内部，史蒂夫却意外的发现，凯特还有另外一重秘密的身份。
播出日期: 2014-02-12
运行时间: 60 min
概述: A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turn their spotlight on Lindsay Denton, the officer who led the convoy but escaped unscathed.
播出日期: 2014-02-19
运行时间: 60 min
概述: Following the tragedy at the hospital, AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit. But Lindsay in turn gathers compromising evidence against the anti-corruption team.
播出日期: 2014-02-26
运行时间: 59 min
概述: Lindsay is denied bail and finds herself targeted in prison. Growing increasingly desperate, she tells Kate about a relationship with an executive police officer and her theory of why she is being framed.
播出日期: 2014-03-05
运行时间: 60 min
概述: Following the violent attack she suffered in prison, Lindsay is granted special dispensation to visit her dying mother. Meanwhile, deputy chief constable Dryden shrugs off allegations about his relationship with Lindsay and possible links to the ambush.
播出日期: 2014-03-12
运行时间: 60 min
概述: Lindsay fights for her life as troubling details emerge of a vicious conspiracy involving corrupt police officers. With growing evidence of links between DCC Dryden and the ambush, Hastings is under pressure to arrest his senior officer.
播出日期: 2014-03-19
运行时间: 59 min
概述: AC12's investigation finally exposes a vicious criminal gang run from within the police. But while Steve now appears convinced of Lindsay's innocence, Kate remains determined to prove she had a role in the ambush.
