Twenty-five years ago HMS Terrapin was part of a crack hunter/killer group in the Battle of the Atlantic. Now she is working out her last commission in the Gulf of Thailand. To Lieutenant-Commander Standish, the frigate seems to mark the end of his hopes of a career in the navy. Then a new captain arrives, a man driven by an old-fashioned, almost obsessive patriotism. And under his stubborn leadership, Standish and the crew discover a long-forgotten unity of purpose.

When Captain Guy Sherbrooke joins HMS Reliant in 1943, he knows he may be her last Captain. Sister battleships have been destroyed, and Sherbrooke cannot alter the bitter truth that there will be no half measures for HMS Reliant.

In 1941, when she was turned into an armed merchant cruiser, the SS Benbecula was already old. Yet even she was needed to protect the vital Atlantic sea lanes. Commander Lindsay, her new captain, had to work desperately to mould the ship’s company - raw recruits and old-timers - into a fighting force. And better than anyone, Lindsay knew this could be his last command, his last chance.

Western Ocean, 1942... From the bridge of HMS Gladiator, Lieutenant-Commander David Howard’s orders were chillingly clear. There could be no mercy. To the men who fought to protect the vital, threatened Merchant Navy convoys in the Western Approaches, the Battle of the Atlantic was a full-scale war. A relentless, savage war against an ever-present enemy and a violent sea - in an arena known only to its embittered survivors as the killing ground. HMS Gladiator was part of that war.

The year: 1943. Now there was to be no more retreat for Britain and her Allies. At last the war was to be carried into enemy territory. And from captured bases and makeshift harbours in North Africa, the Royal Navy's Special Force was to be the probe and the spearhead of the advance. To this unorthodox war came the corvette H. M. S. Thistle and her commanding officer, John Crispin.

HMS Royston, Coastal Forces Depot Ship, is mother ship to a battered, war-worn bunch of MTBs and MGBs. New on board is Sub-Lieutenant Royce: commissioned for three months, sea experience three months in an Asdic trawler, and aged 20. His commanding officer is Lieutenant Harston, aged 23.

His predecessor has been killed in action 48 hours earlier and is now hardly remembered. The crew are all young - some very young - but all old before their time....

January, 1944. When the British light cruiser Andromeda arrives at Williamstown naval dockyard to be handed over to the Royal Australian Navy, she is already a legend - having earned her young captain, Richard Blake, the Victoria Cross in her last victory against overwhelming odds in the Mediterranean. Blake has grown to love Andromeda, so has few regrets when he is unexpectedly told to retain his command with a British and Australian ship’s company.

Hong Kong, 1941... To the residents and defence forces of the Crown Colony of Hong Kong, the war in Europe remains remote. Even the massive build-up of Japanese forces on the Chinese border cannot dent their carefree optimism. Yet one man suspects the truth. Lieutenant-Commander Esmond Brooke, captain of HMS Serpent and a veteran of the cruel Atlantic, sees all too clearly the folly and incompetence of Hong Kong’s colonial administration. To Brooke, attack by Japan seems inevitable.

It was in 1943. On the Black Sea, the Russians were fighting a desperate battle to regain control. But the Russians’ one real weakness was on the water: whatever they did, the Germans did it better, and the daring hit-and-run tactics of the E-boats plagued them. At last the British agreed to send them a small flotilla of motor torpedo boats under the command of John Devane. Devane had been in the Navy since the outbreak of war.

The Mediterranean, 1943... The HMS Rob Roy. A tiny machine, just 230 feet from stem to stern. In peacetime she would have trawled for cod. Now her catch is deadlier by far. Lieutenant-Commander Ian Ransome is a veteran of the treacherous front line of naval combat. Under sealed orders in the battle-tossed waters of the Mediterranean, he and his jack-tired crew face one final test of their courage....

As captain of the crack Tribal Class destroyer HMS Hakka, Commander Graham Martineau must once again call from the ordinary seamen the ultimate in courage, and prepare to defend to the death vital convoys to Russia. No man and no ship is immortal.

The human torpedo, or chariot, is the ultimate weapon in a war, and only men of extreme courage or recklessness volunteer for the special operations missions requiring its use. Reeman has also written 22 novels under the pseudonym Alexander Kent.

The old submarine-chaser USS Hibiscus, re-fitting in a Hong Kong dockyard before being handed over to the Nationalist Chinese, is suddenly ordered to the desolate island group of Payenhau. For Captain Mark Gunnar - driven by the memory of his torture at the hands of the Viet Cong guerrillas - the new command is a chance to even the score against a ruthless, unrelenting enemy. But Payenhau is very different from his expectations....

February 1943. As the balance of the war slowly shifts in Britain's favour, Lieutenant-Commander Steven Marshall brings his battle-scarred submarine into home port. Captain and crew are exhausted after 14 months' continuous service, but for most there can be no thought of leave. If the enemy collapse in North Africa is to be exploited, every experienced man will be needed. Marshall must return to the Mediterranean, but this time to a very different kind of war.

Indo-China 1941, and cruising somewhere off Saigon is the world’s largest, most dangerous submarine, the French Soufriere. The British navy must capture and use her in the defence of Singapore before she is used against them. For Commander Robert Ainslie it is the supreme challenge of his career.