The novel “The Eleventh Commandment” by Lester del Rey was published for the first time in 1962.

Boyd Jensen came to Earth as an exchange student. He knows that the situation on the planet is very different from that on Mars because in 2190 the Earth is still suffering the consequences of the atomic war of two centuries earlier. The situation for the boy becomes much more complicated when he discovers that he has actually been exiled from Mars.

Forced to reinvent a life in a society very different from the Martian one, Boyd Jensen nevertheless manages to exploit his scientific studies and be hired in a biological research laboratory. The searches are supervised by priests of the American Catholic Eclectic Church, a schismatic church that also holds the temporal power and imposed the eleventh commandment which requires people to be fruitful and multiply.