This is a very near future story. The premise is that for reasons unknown, anyone who is killed by someone else suddenly has an almost certain chance of coming back to life. A new profession has arisen - dipatchers. Their job is to kill people at the brink of natural death. This gives their 'victim' a sort of reset. They are alive, at home and in the same condition they were some hours before, 999 times out of 1,000.
This story begins with a dispatcher standing by in a hospital operating room, waiting to see if the patient survives, or if he is going to die on the table. He's there because the dispatcher scheduled for this job is unavailable.
And this is the beginning of a mystery in a world very like ours but for that one difference. Being almost certain to return to life if someone else kills you is changing everything. Scalzi's story reveals this to us a little at a time. Some of it is disturbing, but all of it is a result of that 999 out of 1000 chance of coming back after death, as long as someone else killed you.
I don't want to say anything more about the story, except that it is a very good story, and narrated well by Zachary Quinto. I, for one, am hoping that Mr. Scalzi has plans to write more in this world.