1943 San Francisco CA The city is still edgy. Rumors of a Japanese invasion continue to circulate. America's offensive strategy begins to win battles, raising morale. A lonely sailor on liberty walks down Sutter Street looking for booze and women. What Navy Submariner Nick Devin finds is a Nazi spy ring and big trouble. Torn between his service to America and the demands of the Nazi spies, Nick seeks the FBI's help to bust up the spy ring. Agent Barry Keys, a tough FBI veteran, uses Devin to get to the bad guys. Keys is also determined to rip the heart out of the Nazi threat, to end its quest...