From the back cover:
"Two generations after destruction rained down upon America's cities, the population is scattered into small towns. Cities are forbidden by law, as is scientific research.
"Rumors abound of a secret place known as 'Bartorstown', where science is untrammelled by interference or hatred. A youth named Len Colter, developing an unhealthy thirst for knowledge exacerbated by the discovery of a forbidden radio, sets out on a long road. During this journey, he will change his mind many times before determining the correct direction for himself, and the benighted America in which he lives."
Tomorrow is a mostly excellent, intriguing and sometimes surprising (in a good way) science fiction novel that illustrates, in fast-moving and non-flashy fashion, the struggle between religion and science. Brackett's writing is effective in showing the benefits and drawbacks of both sides of the spectrum. While its ending feels somewhat lackluster, it is solid and logical, a minor nit for this otherwise superb book.