Seven detective stories, each one ilustrating aspects of a mathematical analysis of detective fiction, form a collection lost in obscurity now to be republished, as a young editor and an elderly author go through the manuscript, discussing each story and the theory that pertains to it. But there are odd inconsistencies in each story, and more than that, there is something off about each story. An odd game of hidden secrets is being played between the two characters - is one or both of them a detective, a suspect, or a victim? 

I have to say there was something about this that didn't quite come off - or rather came off too well? - but I can't go into it without spoilers, nonetheless, this is an exceedingly clever and well-crafted homage to the whodunnit