In this book, Adolf Kaufmann, a half German half Japanese teen raised in Japan but educated in Germany returns to Japan. He has been gone for three years and has not been able to contact anyone in Japan for the past two years. He is overjoyed to be reunited with his childhood best-friend Adolf Kamil, a German Jew taking political refuge in Japan. The mood changes quickly, however, since in the past three years non-Jewish Adolf has come to follow the Nazi party beliefs including understanding Mein Kampf.
Non-Jewish Adolf's mission in Germany is to find the documents that show that Hitler has Jewish ancestry. (By now everyone but Adolf realizes that the documents don't mean much and that the war is nearly over.) Adolf has also been assigned to kill a certain Japanese man, who has been hiding the documents. Adolf is shocked to find that his mother has remarried, and to the very man he has been ordered to kill. So that pretty much does it for Adolf's relationships with friends and family back in Japan.
This book follows the Adolfs and Toge, the narrator, through the last few months of WWII and then through their lives after the war, particularly what happens to the two Adolfs. So many minor subplots from other books are resolved here, but won't be distracting if you haven't read other books in the series. This book stands alone well, and will also add more to the story if you have read the other books.
This is a really great amazing series. I recommend it. These are violent books and this one in particular, with a rape, mass executions and plenty of blood gore and violence. So be aware of that and don't give it to a small child to teach them history.