This book was almost the reverse of Out of the Silent Planet for me, in which the beginning was dark but the book as a whole was not. In Perelandra, it starts off pretty quietly, with Ransom essentially being supernaturally transported (no actual space travel involved this time) to Perelandra, or Venus, and then about a third of the way through the book, something evil arrives. I personally find this kind of evil, the conniving and sinister type, to be the most disturbing and haunting. But although set in another planet, with wonderfully imaginative world-building, this book is ultimately an exploration of theology. I can't exactly say that I enjoyed the book, but it was intriguing and well done.