"What nuclear war may do to the world we know is a closed book to mankind—but here’s what coming eras may bring!" After nuclear war, scientists in Biological Control Labs monitor the former bomb sites, fearing that a mutated animal will develop the intelligence and power to become a threat to humans. One day, men sent to investigate alarms activated in the nuclear wasteland in the New York area find more than they bargained for. - Summary by Elsie Selwyn