The Russian and British navies are conducting joint military maneuvers in the Irish Sea. Suddenly, a Russian sub suffers a radiation leak--or at least that's what everyone thinks. In reality, the sub has been hijacked by an ultra-radical wing of the IRA that wants to continue the fight with Britain. Worse still, the terrorists already have the launch codes for the nuclear missiles on board. With London under threat of nuclear destruction and a political powder keg ready to blow, TALON Force is called in to re-take the sub, disarm the nuclear payload, and deal with the extremists--the only way they know how.