The war against terror has been fought for decades between the British government and the Provisional Irish Republican Army. But with the creation of the 'Mask' team, the war has taken a new turn.
Their task has been to find and bring to justice Irish terrorists operating on the British mainland. But sinister forces are at work to halt this process in the guise of an unholy alliance. Dissident Irish terrorists, radical elements within the Basque separatist group ETA and Muslim extremists led by a brutal killer have formed a relationship to advance their individual causes; their target is Britain.
A ruthless and totally unexpected terrorist campaign begins and the Mask team faces their greatest challenge as they themselves are targeted and their personal security becomes compromised.
It is soon obvious that those involved extend into the highest levels of British government and intelligence services. With the Prime Minister's blessing the team must find the terrorists responsible and eliminate them.