The Space Trilogy is one of my favorite series, and Perelandra is no exception. The story, on a first reading, appears to be a little bit slow, but as you begin to understand the book, you realize that none of the book is wasted. Lewis takes plenty of time to build up the idea of a sinless paradise. This actually makes Weston's evil stand out so much more. To the non-Christian, this story could be a little confusing, but it really ends by showing a possible alternate way our history could have been if Eve had resisted temptation. At the end, there is an excellent scene of worship to Maleldil. Although some people may find it slow, the beginning scenes before Weston comes and the end after Ransom gets out of the cave are my favorite sections of the book.
