This is partially a story about the meaninglessness of war, and partially a story about star-crossed lovers, but the main theme recurring through both deals with the protagonist's inner conflicts as he winds up changing allegiances multiple times throughout, sometimes through choice, sometimes necessity.
Now, it really requires a lot of suspension of disbelief in the beginning of the story to buy that a German soldier and a woman in the resistance would be able to both sneak off from their duties and none of their fellow soldiers on either side noticing, but if you can look past this, this is a well-produced and well acted drama that manages well to depict the cruelty of war and tough choices without feeling gratuitous or cliched, though the ending is rather ambiguous and will leave you thinking.
Now, it really requires a lot of suspension of disbelief in the beginning of the story to buy that a German soldier and a woman in the resistance would be able to both sneak off from their duties and none of their fellow soldiers on either side noticing, but if you can look past this, this is a well-produced and well acted drama that manages well to depict the cruelty of war and tough choices without feeling gratuitous or cliched, though the ending is rather ambiguous and will leave you thinking.