IN THE AGE OF SURVEILLANCE, HOW CAN A PERSON GO MISSING? Set in 2187, Gates of Mars blends science-fiction with a classic, hard-boiled detective story. Crucial Larsen, 41, a veteran of the brutal Consolidation Wars, is working as a labor cop on Earth. The planet is a toxic dump and billions of people are miserable, but he doesn't care. Not his business. It took him a long time to get to the good life, or a good enough life. But then Essential,...