the wild country where, as the authorities say, nothing is reliable and the devil does his work. David grows up surrounded by admonitions: KEEP PURE THE STOCK OF THE LORD; WATCH THOU FOR THE MUTANT. At first he hardly questions them, though he is shocked when his sternly pious father and rigidly compliant mother force his aunt to forsake her baby. It is a while before he realizes that he too is out of the ordinary, in possession of a power that could doom him to death or introduce him to a new, hitherto-unimagined world of freedom. The Chrysalids is a perfectly conceived and constructed work from the classic era of science fiction. It is a Voltairean philosophical tale that has as much resonance in our own day, when genetic and religious fundamentalism are both on the march, as when it was written during the Cold War.