A very fun and short novella from Sanderson. The story is a private investigator's case to find a stolen piece of technology, but I feel the book is really a somewhat humorous character study. I can't tell if Stephen is someone with access to a(nother) new magic system or a super genius with an eidetic memory that partitions his mind in an effort to process the information. I'm inclined to lean towards the new magic system, but there aren't immediately any other users in the book's world. It's a great, short read that shows all of Sanderson's world-building talents. I just wish it were longer.