This one's a bit hard to classify because it's fully a mystery, a SF adventure, and a Fantasy, rolled in one. :) 
 Enter in a major universe-changing condition: 999 out of 1000 murdered people come back. They arrive naked in their homes after the moment of their death. There is always that one that doesn't, though. 
 Enter in the shady and the not-so-shady people who take advantage of this little universal loophole. Dangerous operations in hospitals can be reset for a couple of hours. Horrible accidents on the street can be erased, assuming that the person gets murdered in time. And bloodsports, of course. 
 There's always consequences, of course, but in this novella, so many of the little loopholes are explored nicely and there's a great little mystery-twist to tie it all together. 
 All told, I thought this was rather a little gem. :)