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....

HMS Temeraire: latest and most advanced of Britain's nuclear submarines. When Temraire's trials are cut short and she is ordered to the Far East to reinforce the fleet against a threat from Red China, her captain, David Jermain, knows that this is no routine exercise in flag-waving. And once in Asian waters, he and his submarine find themselves involved in a hidden, undeclared conflict beneath the sea.

They were the men and women of the Royal Navy's Special Operations units. Carrying out lightning raids on hostile coasts, they became a navy within a navy - each handpicked for their individual skills, and all of them courageous. Against the mighty backdrop of World War II they performed their small but deadly operations - living often beyond hope, sometimes beyond mercy. This is the dramatic story of a handful of such people. The Volunteers.

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.

As the Second World War progresses, the destruction of Allied shipping mounts. Fighter pilot Tim Rowan is posted to an escort carrier to help guard the precious convoys. His adventures take him first to the Arctic and then the Indian Ocean.

They are called 'The Glory Boys', by those who regard their exploits with envy. Bob is one of them. Already a survivor of the close action in the English Channel & North Sea, in January of 1943 he is ordered to the Mediterranean & beleaguered Malta.

It takes a special sort of courage to serve in midget submarines, and Lieutenant David Seaton, commanding officer of XE16, needs no reminding of the perils involved. The little X-craft with their four-man crews have been used against heavy enemy surface units and important harbour installations. But in 1944, with the Allies poised for an invasion through France, a new and more hazardous role is given to Seaton's flotilla.

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.

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.

From the author of The First to Land, a novel set during World War II. They called them the Scrapyard Flotilla. After a quarter of a century of service, the eight destroyers had seen all kinds of action. Now they were to be used in raids to open the way for the invasion of Occupied Europe.

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.

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.

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.

Malta 1941. To most people H.M.S. Saracen is just an ugly, obsolete ship with an equally ugly recent history: her last commander is due for court-martial after shelling the troops he was sent to protect. But to Captain Richard Chesnaye she brings back memories - memories of the First World War when he and the old monitor went through the Gallipoli campaign together. It seems that captain and ship are both past their best. But as the war enters a new phase Chesnaye senses the possibility of a fresh, significant role - for him and the Saracen.