I just backed this, and read through the first mystery in the bunch. It's going to be SO fun to play! The prompts are all excellent but I am really hyped about the NPCs. Every single one of them is someone I want to show up in a game. Even Dave.
I can't wait for the rest of the mysteries! The summaries look great, and (selfishly) our playgroup has gotten through nearly all the other mysteries so MORE is always better :D