The second novel in Lewis's science fiction trilogy tells of Dr Ransom's voyage to the planet of Perelandra (Venus).

On Perelandra Dr Ransom finds himself battling to preserve a second Eden from the evil forces present in the possessed body of his enemy, Weston. Ransom eventually destroys the body of Weston, which he calls the 'Un-man' and is thanked by all the creatures of the planet which come to greet him.

Through the fantasy of Perelandra, Lewis explores issues of good and evil, God and the devil. His vividly imaginative description of another world is remarkable and delightul.