The deadliest ship in the world has fallen into the hands of a terrorist enemy -- the submariner believed to be behind the destruction of the Thomas Jefferson has returned to seek his revenge on his Iraqi paymasters and the country that betrayed him. He defects to Iran, where he is helped in his plan to transform a stolen submarine into a unique weapon capable of causing the most shocking air strikes in an American history. His vengeance on the US is devastating, H. M. S. Unseen is lost, and the blame appears to lie with Iraq. It is up to Admiral Arnold Morgan, to prove his suspicions that Iraq isn't responsible, and that Ben Adnam is the only man skilful enough to orchestrate such an attack. And he must stop him, whatever the cost ...