Colourful commemoration of Royal Yacht Britannia's majestic visit to Leith in 1956, courtesy of Messrs Joseph and J Arthur Rank.

After an abrupt and violent encounter with a French warship inflicts severe damage upon his ship, a captain of the British Royal Navy begins a chase over two oceans to capture or destroy the enemy, though he must weigh his commitment to duty and ferocious pursuit of glory against the safety of his devoted crew, including the ship's thoughtful surgeon, his best friend.