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Here is the goodreads' synopsis of Billy Summers:
Billy Summers is a man in a room with a gun. He’s a killer for hire and the best in the business. But he’ll do the job only if the target is a truly bad guy. And now Billy wants out. But first there is one last hit. Billy is among the best snipers in the world, a decorated Iraq war vet, a Houdini when it comes to vanishing after the job is done. So what could possibly go wrong?
The limited series "Lisey's Story" and 11. 22. 63 are the other Stephen King's published story that Bad Robot has adapted.