Constantine looked into the tank. Behind the glass window, below the surface of the water, was the waterlogged head of Paolo Mavrides. The dark, curled hair, a major trait of the Mavrides gene-line, floated soggily around the young man’s neck and shoulders. The eyes were open, greenish and bloodshot. Injections had paralyzed his optic nerve. A spinal clamp left him able to feel but not to move. Blind and deaf, numbed by the blood-warmed water, Paolo Mavrides had been in sensory isolation for two weeks.