Don't get me wrong, I really enjoyed it.
It's just with all the people and stories introduced at the start, along with the "secret". I assumed all these characters and plots would all tie up in the end.
However, they didn't. Plot lines and characters seemed forgotten as it went on.
For example Miss Wade & Tattycorum and Amy's friend. All seemed very mysterious at the start but by the end they were very minor and forgotten completely in the case of Amy's friend.
Also the butler having a twin through me. I thought he was murdered only to pop up like nothing happened which really perplexed me.