The divide-and-conquer narrative structure of this season’s The Walking Dead continues to pay dividends. Two weeks ago, it was an episode devoted to Eugene. Last week, it was a road trip with Rick and Michonne. And tonight, we spend a lot of time with Carol – different characters, different agendas, very different settings within this show’s post-apocalyptic nightmare world. Tonight’s episode may sport some grave secrets – and based on an image from the network promo, I mean that literally.