Just finished reading Billy SummersI started Stephen King's Billy Summers yesterday, I'm somewhere between a quarter and a third of the way through and I have to say, it's reminding me quite a bit of 11.22.63 with the whole "guy assumes a fake identity and has to try not to blow his cover while waiting to kill someone" shtick.
(And before anyone cries "spoilers", there's nothing there that you won't read on the back of either book.)
It is essentially a hitman "one last job" thriller. The story is pretty unoriginal, but King just makes me care about the characters like no other author can. The villains are also three dimensional despite being at the same time quite clichéd. I hope he keeps writing non-horror for many more years as I can't get enough of it.