London is under siege from a new group of terrorists calling itself the Real IRA. Destruction, mayhem, and the loss of life is threatening the very fabric of life in England by a group wanting the unification of Ireland at any cost. At her wits end, the head of MI5 resorts to recruiting the only man she knows with the capabilities and connections with the IRA to help track down the rouge group. In his usual manner, Lord Croft breaks almost every rule in the book to help with surprising revelations of who is masterminding the plot as he uses every trick he knows.