So there's a lot going on in the eighth installment of this series and it kept me guessing until the end, making it hard to put down. As always, the characters are a big part of what makes me return to this series, whether protagonist or antagonist, they each have their own intricate backgrounds and unique personalities.
My only criticism is that I didn't find Mr. Holt's motive very believable. I could get on board with Mrs. Holt's obsessive dedication to her sister but I didn't really understand why her husband would get involved.
After eight books, it has not gotten stale at all and I'm already eagerly awaiting the ninth book.