Out of the Silent Planet
The great theological riposte within early SF — proof the genre could argue with itself at planetary scale — and the seed of the Ransom trilogy, whose finale That Hideous Strength fed directly into modern dystopian fantasy.
Series Guide
The Cosmic Trilogy
by C. S. Lewis
Out of the Silent Planet, Perelandra and That Hideous Strength: Lewis's interplanetary romances, in which the silent planet is Earth and the space between worlds is anything but empty.