故事发生在萨福克东部的一个沿海小镇上，一位名叫劳拉妮的女孩失踪了，数日后，人们找到了她早已经冰冷的尸体。凶手没有留下任何的蛛丝马迹，警方无从查起，这也就意味着，这个小镇里的居民们中，很有可能就隐藏着一位变态的杀手。
罗斯（赫米奥娜·诺里斯 Hermione Norris 饰）带着两个孩子杰米（阿历克斯·阿诺 Alexander Arnold 饰）和李维（艾丽·巴姆博 Ellie Bamber 饰）过着相依为命的生活，家里即将迎来一名新的成员本（马丁·克鲁勒斯 Martin Clunes 饰），整个家庭本来应该沉浸在假日的欢快气氛之中，但某日，罗斯偶然在杰米的房间里发现了一双染有红色污渍的鞋子，这让她不得不开始怀疑，杰米和劳拉妮的命案是不是有什么关联。
“In the early 1990s, at the height of the international war on drugs, the government agency in charge of Britain’s borders, Her Majesty’s Customs and Excise, realized that they were losing the battle against drug smuggling. Their solution was extraordinary,” reads the logline. “In a top-secret operation, a small team of British Customs employees were sent undercover. Their task – to infiltrate Britain’s most dangerous drug gangs.” “They were not trained spies. These were ordinary men and women, plucked from ordinary lives around the U.K, put through a basic training regime then told to build new identities in the criminal underworld. These identities were called Legends.
改编自维克托·拉瓦列2013年的小说《The Devil in Silver》。聚焦搬运工人Pepper（丹·史蒂文斯 Dan Stevens 饰），因为坏运气和坏脾气，他被送到了一所名为New Hyde的精神病院，里面满是被社会遗忘的人。Pepper想要获得自由，就必须面对与他作 对的病人、怀着阴森目的的医生，甚至恶魔本人。这里是地狱般的地方，任何事情都不是表面那样，Pepper必须直接面对一个以New Hyde里人们的苦痛来蓬勃壮大的存在，但这样可能会证明：最可怕的恶魔恰恰是他自己。
