Geordie Sharp, a sergeant in the SAS, is struggling to pick up the threads of his army career. Wounded in the Gulf War, he returns to Hereford to find his home life in tatters. As he trains with Northern Ireland Troop, a murder in his family fires him with personal hatred. Posted to Belfast, he discovers that his adversary is Declan Farrell, a leading player in the Provisional IRA. Sharp sets out to stalk and kill his man... yet the waters run deeper than he supposed.