Jungle Heat
is set in pre-WWII Hawaii. A group of pro-Japanese fifth columnists infiltrate the islands, intended to demoralize the populace long before the Pearl Harbor attacks. Specializing in sabotage, the spies target the pineapple and sugar plantations, not to mention the big-city industries. American doctor Jim Ransom catches on to what's happening (though it seems to take him forever), and, together with National Guard officer Richard Grey, foils the villains. It is worth noting that the principal villain in
is not Japanese, but an occidental traitor played (or overplayed) by James Westerfield.