Well this is the last book of his space trilogy. I finally finished it. I'm not sure what to say about this book. I didn't really like it. A lot of gross things are described in it. The basic idea of the book was interesting, but it just got a little too gruesome for me. I really enjoyed the first two books of the series. Here is the Wiki page on it. It says it was highly influenced by his friend Charles Williams, that may be why I didn't like it.