Captain Griff Avery of the OSS uncovers a German operation to create a jet-propelled bomber capable of making a deadly hit to American shores. But when he suspects the woman he loves is a German spy and he falls under suspicion himself, he must wage a secret war of his own. He recuits the crew of a B-17 Flying Fortress and a reckless group of flyboys to help him stop the rogue German SS General behind the plot.
