Loved the ending! I can't believe no one had figured out who was going to be living in the apartment at the end of the hall. I had it figured out as so as they realized it was being fixed up. It might have been wishful thinking, though :)
I guess 5 cases would be a record of some kind. Harper being dead the whole time was a big shock. I'd realized she was dead when Charlie was in the basement, but I hadn't realized she'd been dead the whole time! There were hints, but I didn't consider it to be possible.