It’s 1917, and World War One rages on. Britain depends on merchant shipping for its survival, but German U-boats are causing havoc on the high seas. Indeed, British trading vessels are being sunk at the rate of 23 a week by the Germans. But one day an artist called Norman Wilkinson has a brain wave; he believes he knows how to conceal large ships from the prying periscopes of U-boat commanders.
At the outbreak of World War One in July 1914, many people believed the fighting would end by the Christmas of that year. Of course, though, that was an entirely false hope, and the war turned into a grinding conflict of attrition that stretched on for four long years.