I don’t really know what I just read. The Accident Season is a supernatural YA thriller that purports to have a mystery at the heart of it. Yet the deeper we go into the story, the more that mystery unravels into almost a bait-and-switch. Populated by the barest hints of ghosts, fairies, changelings, and other such spirits, this book tugs at your brain in a pleasing way, but I’m not sure, in the end, it…