Dark Universe by Daniel F Galouye

Paperback. Condition: Good. 1961. Bantam. 1st Printing.

The author's first novel. The survivors live underground, as far from the Original World as possible and protected from the ultimate evil, Radiation. Then terrible monsters, who bring with them a screaming silence, are seen and people start to disappear. One young man realises he must question the nature of Darkness itself.