When war breaks out in the lull of summer 1914, it surprises and pulls millions of men in its wake. Christmas arrives, with its snow and multitude of family and army presents. But the surprise won't come from inside the generous parcels which lie in the French, Scottish, and German trenches. That night, a momentous event will turn the destinies of four characters: an Anglican priest, a French lieutenant, an exceptional German tenor and the one he loves, a soprano and singing partner. During this Christmas Eve, the unthinkable happens: soldiers come out of their trenches, leaving their rifles behind to shake hands with the enemy.