Historiography
I recently finished a pair of books: The French: Portrait of a People by De Gramont and Barbarian Migration and the Roman West by Halsall. Both were interesting in their own right, but I found them even more fascinating from the standpoint of historiography. Both books were good reminders that history is not the dispassionate, factual, or objective enterprise that the general public mostly seems to regard it as. All history is subjective and reflects the worldviews, objectives, and morals of the historian (and the society in which the historian lives).