I love that each of these books builds on the one before it while staying true to the characters. Charlaine Harris so often builds on events that have happened in previous novels, that you are constantly making connections and understanding the significance of previous events.
In the first couple of books, it looked as though Bill and Sookie would remain a couple. That didn't exactly work out though, and the whys are still being revealed here, in book 7. Now, Bill is regretting his actions (why he initially began dating Sookie, and his subsequent betrayals of her) and trying to get back in her good graces. Eric, on the other hand, looks like the strong contender to win Sookie's heart for good, by this point in the story. Although they have had a rocky relationship thus far, it's become clear that love with Eric is by far the better path for Sookie's heart to follow.
On a platonic note, it's great how Pam and Sookie's relationship has evolved into an actual friendship. It can't be what either of them would ever have expected, but is really a pleasure to see happen. Their mutual acceptance of each other has gradually morphed into genuine fondness, and it feels real and believable, too.
This book continues to explore all of the inter-woven relationships in Bon Temps amid assassination plots, and murder trials, AND show how the whole Louisiana community (both human and supernatural) was affected so deeply by Hurricane Katrina.