Kammala jumla mai zuwa: A Belfast, Satumba 1983, a tsakiyar The Troubles, Sergeant Sean Duffy, daya daga cikin 'yan Katolika a Royal Ulster Constabulary (RUC), an fitar da shi daga RUC a kan zargin da aka yi. A lokaci guda, Dermot McCann, wani mashahurin dan kunar-bakin-wake na IRA kuma tsohon abokin makarantar Duffy ya tsere daga kurkukun Maze kuma ya zama babban makasudin leken asirin Burtaniya. MI5 ta ja Duffy daga ritayarsa na maye don bin McCann. Littafin ya biyo bayan ƙoƙarin Duffy don warware kisan kai a cikin ɗakin da aka kulle don samun bayanan ciki game da inda McCann yake, wanda hakan ya haifar da
yunkurin kisan gillar da aka yi wa Firayim Ministan Birtaniya Margaret Thatcher a Brighton.