Someone is killing the world's leading experts on robotics and artificial intelligence. Is it a tech company trying to eliminate the competition or is it something even more sinister? After all, artificial intelligence may be the deadliest battlefield gamechanger since the creation of gunpowder. The first nation to field weapons that can act at the speed of computer commands will rule the battlefield. It's an irresistible lure for most, but not for the Gray Man. His quest for a quiet life has led him to Central America where he and his lover, Zoya Zakharova, have assumed new identities. Eventually, they're tracked down and offered a job by an old acquaintance of Zoya's. He needs their help extracting a Russian scientist who is on the kill list. They reject the offer, but just being seen with him is enough to put assassins on their trail.