"I have never seen [its] theme handled with greater technical dexterity or given more psychological meaning."�Fantasy and Science Fiction

When a routine tour of a particle accelerator goes awry, Jack Hamilton and the rest of his tour group find themselves in a world ruled by Old Testament morality, where the smallest infraction can bring about a plague of locusts. Escape from that world is not the end, though, as they plunge into a Communist dystopia and a world where everything is an enemy.