Promissory Payback is a longer than Unrevealed but featured only one story. I liked this one because I felt like I got to see a little more of how Jane Perry works. She has a way of making people talk even when they don't want to reveal anything about themselves. I enjoyed watching her work out who the killer was. I think to talk about it more would ruin it for you. It is definitely worth a shot. I know I will be picking up the full length Jane Perry mysteries in the future!