Dirty Old Tricks

Inspector McCann has been called to investigate the brutal murder of a teenage girl, at first assuming it is a sex crime or a sectarian tit-for-tat killing. But as another girl is killed, and then the prime suspect is found murdered and castrated, the Belfast detective finds himself trapped in vicious old rivalries, unsupported and alone. Are the murders connected to 'dirty tricks' by the combatants in Ireland's war, or has McCann lost the plot, as his boss suggests?