David Wallat是刑事局經驗豐富且備受尊敬的警官。殺害兒童的Joseph Maria Hagenow在長期監禁後獲釋，Wallat主動與同事Lisa和Eric 一起監視Hagenow。當年正是Wallat將Hagenow逮捕歸案，但事情並沒有因此完結。雖然警方認為Hagenow對社會仍有危害，但由於法律因素，他必須被釋放，接受警方的監視。Hagenow搬去一個小村莊，相信人性本善的Berkenbusch牧師為他提供住處，警官們則搬進對面的一間公寓。Wallat很快就發現，控制欲強的Hagenow正在跟警察大玩心理遊戲，他挑釁他們並引誘對方現身。Hagenow的詭計一開始沒什麼作用，直到Wallat的錯誤導致事態升級：一個孩子失踪，村民意識到搬進牧師住宅的人是誰，隨著情況逆轉，Wallat面臨全面失控的危機。
David Wallat is an experienced and respected police officer at the LKA. When the child murderer Joseph Maria Hagenow is released after a long prison period, Wallat volunteers to monitor Hagenow together with his colleagues Lisa and Eric – because Wallat still has a unfinished business with Hagenow, whom he brought to justice at the time. Hagenow is still considered dangerous, but had to be released after his arrest for legal reasons and is now under observation. Hagenow moves to a small village where Pastor Berkenbusch, who believes in the good in people, has offered him a place to stay. The policemen move into an apartment opposite the rectory. Wallat soon realises that the manipulative Hagenow is trying to undermine the guards by starting to play psychological games with the policemen, to provoke them, to play them off against each other, to draw them out. Hagenow’s tricks show little effect at first – but then it is Wallat’s mistake of all things that leads to escalation: A child disappears, the villagers find out who has moved into the vicarage, events turn upside down and Wallat is in danger of losing control of the entire operation…
