节目的背景设定在当今的利物浦，20 多岁的埃利奥特和杰丝是最好的朋友，他们因失去彼得（埃利奥特和杰丝的双胞胎兄弟的初恋也是唯一的恋人）而悲痛欲绝。当埃利奥特遇到威尔时，他开始以为自己可以忘掉过去，但当埃利奥特得知威尔也有自己的秘密时，杰丝也被一个自称是她哥哥的人联系上了。

We follow the hits and (more often than not) the misses of two hapless, dead-broke contract killers who frankly, are more of a danger to themselves than to anyone else. Each episode sees Fran (Sue Perkins) and Jamie (Mel Giedroyc) try to track down and kill a different target. But every hit turns into a shambles of mistaken identities, mistimed entrances and misfiring weapons. Whether it’s losing their target in the woods or not being sure which one of a pair of identical twins they’re supposed to be killing, things rarely go according to plan.