In occupied France during the Franco-Prussian War, a young French laundress shares a coach ride with several of her condescending social superiors. But when a Prussian officer holds the coach over, social standings are leveled and integrity and spirit are put to the test.

Panic arises among Allied POWs aboard a Japanese freighter when they learn that the ship is actually a decoy target for American submarines on night patrol. The prisoners unite and attack their Japanese captors just as an American sub surfaces and, not knowing the prisoners are aboard, prepares to torpedo the ship.