In the past year, politicians, scholars, journalists, and seemingly everyone else with a point of view on the dramatic events of the last presidential election have come out with campaign "tell-alls." They intend to shed some light on, in the words of one of the books on this list, What Happened. It can be difficult to sort through them and know which is worth reading, depending on what you're looking for. Just in time for the holiday season, we present a definitive guide to who should be reading what, and why.