This is a high-octane, no-holds-barred thriller set in the days of the struggle for peace in Ireland. Britain's top counter-terrorism operative, Mike Devon, is on a collision course with the Provisional IRA's most feared assassin, Fergal McSweeney, a man responsible for the death of Devon's girlfriend.
As both sides wage a final war of attrition, the action relentlessly from Chicago to London, and from Glasgow to Belfast, before a final bloody finale in the suburbs of Dublin.
Standing in the middle is a young police detective determined to avenge the death of his mentor and rid the streets of the gunmen - from all sides - once and for all.
When the dust settles, who will walk away?