Billy Summers is a killer for hire. He's among the best snipers in the world, a decorated Iraq war vet who can blend into any neighbourhood and vanish after the shot is taken. But he will only agree to the contract if the target is a truly bad guy. And now Billy wants out. But first he's offered one final job - an offer which is just too big to refuse. Billy is given a fake identity as a writer, and a high-rise office from which to make the kill. But as the days count down to the hit, Billy becomes convinced that something about the job is wrong. He does not yet know just how wrong, or about the woman who will help him try to set things right.