The story of one of the most infamous cases in UK criminal history, that of serial killer Dennis Nilsen. Told through the prism of three men, the series explores the personal and professional consequences of coming into contact with a man like Nilsen.

误杀无辜的老师Mark Cobden（肖恩·宾 饰）出于愧疚和忏悔接受了为期四年的监禁；尽职尽责的狱警Eric McNally（斯蒂芬·格拉汉姆 饰）在高压的监狱系统下工作，并全力保护着他所看管的犯人。然而，当狱中危险罪犯以Eric所爱之人的安危威胁他时，他陷入了两难选择。《争分夺秒》是对惩罚与忏悔最直白的探讨，坚定无畏且给人希望。