The centerpiece of the plot - a Japanese holdout soldier named Kurusu - was probably inspired by a couple of discoveries of Japanese holdouts in the 70s. The most famous was a Lieutenant Onoda, found in the Philipines.
I'm not certain how to classify the book - historical fiction, action/adventure, etc - and it touches on several topics without going overboard, to its credit. These topics include the politics of a country dealing with having been a former colony, the former colonial settlers (in this case, American landowning farmers) who remained behind after independence, culture clashes (Japanese bushido juxtaposed with the tight American expatriate community and juxtaposed with the local Filipino culture, etc etc - you'll figure it out
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Its easy to view the book as a shallow 70s work (and a discerning reader will see some of that in the style; it has some elements of old chauvanism and "macho" mentality) but its main theme seems to be one of a search for belonging: outcast soldier Kurusu found it as a Japanese Kempentai warrant officer and maintained it while terroizing the locals for 30+ years as a holdout, American Mike Brandon's search for his place in life before he returned to his "home" (the Philipines), the American community's desperate charade of colonial power after the Philipines became independent, Capt Shimura's coming to terms with his wartime activities when he comes to search for Kurusu....etc etc. But none of this gets too deep - the action flows along and it all balances. There is also a minor romantic sub plot. (amazon reader review)
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