The Hangman is a machine designed to learn and explore. He was trained via a neurolink by some of the greatest minds alive. But when the Hangman was sent to explore the outer solar system it went rogue and disappeared. Now it has returned to Earth and its developers are being killed one by one. It's up to our nameless protagonist to stop the killing, but to do so he has to understand why these killings are taking place.
Winner of both the Nebula and the Hugo Award
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