From Book 1:

Just as readers have been transfixed by the stories, characters, and deeper meanings of Lewis's timeless tales in The Chronicles of Narnia, most find this same allure in his classic Space Trilogy. In these fantasy stories for adults, we encounter, once again, magical creatures, a world of wonders, epic battles, and revelations of transcendent truths.

Out of the Silent Planet is the first novel in C. S. Lewis's classic science fiction trilogy. It tells the adventure of Dr. Ransom, a Cambridge academic, who is abducted and taken on a spaceship to the red planet of Malacandra, which he knows as Mars. His captors are plotting to plunder the planet's treasures and plan to offer Ransom as a sacrifice to the creatures who live there. Ransom discovers he has come from the "silent planet"—Earth—whose tragic story is known throughout the universe!