Perelandra, C. Lewis :: Hard not to have a lot of C.lewis on this list. This second book in the Space Trilogy, beginning with Out of the Silent Planet, is an allegory of Eden and the Fall. Gosh I love those Macmillan covers.
The Space Trilogy, Omnib: Three Science Fiction Classics in One Volume: Out of the Silent Planet, Perelandra, That Hideous Strength - Kindle edition by C. S. Lewis. Religion & Spirituality Kindle eBooks @ Amazon.com.