I have only read the first two books in this series. I have a baby now and what was once a routine event, reading, is now a luxury. But the books I have read so far are AWESOME. I'm not even a sci-fi enthusiast, but these books really drag you into the possibilities of what humanity would be like had sin not been exposed. The main character visits Mars and Venus where the inhabitants have had the same opportunities as we have, yet they have done things drastically different. The second book really emphasizes that the reason Earth is so full of sin is because of Adam and Eve; they altered the course of everything - and Jesus is the one who came to save us from it. It's been a few years since I finished the second book, but whenever I watch the news and ask myself where'd everything go wrong, I remember the Beginning and have my answers. Not to blame Adam and Eve, but to put everything into better perspective. They ate the fruit of the tree of the knowledge of good and evil. They didn't have to, but they were tempted and did. These books take that theme and, from an Earthling's outlook, give us another way of viewing what could have been and what will be - if we only accept "the gift of God which is eternal life through Christ Jesus our Lord." (Romans 6:23).
Like a previous reader, I read the books years ago, loved them, and then lost/loaned them and am now replacing them to read again. C.S. Lewis is able to make you think "outside the box" and presents a view of the earth, man, and the sin issue in a new and profound way. Too many Christians do not understand the greatness of the God of the Universe and how or why that great God would have anything to do with sinful humans. As for the few "curse words" mentioned before, they are very minimal and not prevalent throughout the book and, when used, reflect the sinful nature of man. I gave the quality only 4 stars because the 3 books in 1 is a little bulky and hard to carry around. If you read at home or don't mind the bulk it is no problem.