The North Koreans have created a lethal super virus... Terrorists have hijacked a Russian nuclear submarine... Together, they are planning an attack that could have deadly consequences... Using their spy networks in Seoul and Moscow, British Intelligence establish that the North Koreans are manufacturing a lethal super virus. They also learn of a planned attack on a major western city, to be carried out by terrorists using a hijacked Russian nuclear submarine. Are these two strands of intelligence linked? MI6 send a small team of specialists into North Korea with orders to verify if a virus does exist. Led by Frank Ryder, an ex-SAS operative, who is accompanied by Dr. Grace Seymour, an army virologist, the team search the remote central highlands to find the manufacturing facility. Meanwhile, the British Navy"s "state-of-the-art" nuclear submarine, HMS Ambush, is ordered to find and destroy the hijacked Russian submarine. The crew must endure weeks of cat-and-mouse searching, but will...