True classic castle thieving, with a great twist (and while a twist in a mission like this might be cliche to some, I still really enjoy it). AI was very buggy, but considering the standards for Thief it actually performed fine. Performance outside the castle was poor, but once you're inside it's completely fine and looks beautiful.
The absolute best thing about this mission was the music and sound design. To me, Thiefs greatest strength is it's ability to create atmosphere through sound. This mission had astmosphere in droves.
Once you enter the Lord's bedroom, you learn everything you need to know about him just from the sound the room gives off. I think this is fantastic.