A young Royal Navy officer assumes command of a captured enemy corvette Rated now as a sloop-of-war, his ship is assigned to the Channel Fleet, engaged in blockading the Atlantic coast of France. Later, Captain Mullins and his ship are sent to the Mediterranean where he finds himself fighting Moorish pirates as well as the French navy.

Captain Mullins, commanding HMS Vigilant, has been sent to the eastern Mediterranean to discover what Bonaparte's naval forces have been doing there. Finding French troops are being landed on some Aegean islands, Mullins does what he must to put a stop to their activities. Moorish pirates too, are found to be savaging the inhabitants of several of the islands. The frigate and her crew soundly defeat several of the pirate ships and their slaves are freed.

Captain Charles Mullins, a post captain of the Royal Navy, battles the forces of the French empire in the early years of the Nineteenth Century.

Captain Charles Mullins, RN is charged with investigating a newly appointed captain who is reported to have driven his seamen into a near state of mutiny. Later, reports come in from espionage sources that A French officer has plans to invade Ireland.