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.