In the summer of 1940, Europe lies in the hands of Nazi Germany. Britain stands alone. Under the threat of imminent invasion, it is the Royal Navy and their battles in the English Channel that keeps the enemy at bay. Into these waters comes the new destroyer, H.M.S. Brackendale, and her rebellious young commander, Richard Thorburn. His orders are to take the fight to the enemy, to 'Seek, Engage and Destroy.' With little preparation, Thorburn finds himself thrown into the desperate, close-range skirmishes of the narrow seas. From the Straits of Dover to the northwest of France, from east to west, they face a ruthless foe. For Thorburn, when given the challenge of a new and hazardous mission, devotion to duty calls. In spearheading a clandestine operation, the ship, the crew and her captain, always in danger, deep inside enemy waters, are pushed to the limits of endurance. Courage is the order of the day.