"The journey in the tunnel of light was swift and long, joyful and painful, past memory, past history, past all knowledge of evil, past anger at his shooting and the separation from his family, until there was little that remained of the Earth being. Only life as it had been in the tunnel of light." Earth is a mistake in the Universe, a violent planet destined to be destroyed by nuclear war in 2070. William Blake, a visitor from a peaceful planet, believes that human violence can be cured through genetic and environmental manipulation, and that Earth should be saved. Blake looks like an...