The Rings of the Master books are the kind of science fiction that you like to read over and over again. They are not particularly original - after all, there have been countless books written about computers being in control of humankind. But they're fun to read, the characters are great, and the aliens are as weird as aliens can be. And I have to say, the code that the protagonists have to eventually figure out at the end is pretty genius - see if you can decipher it before they do! I give this series three stars for content, five stars for enjoyment. Don't bother with it if you're in the mood for something really deep and earthshaking, but I still number these four books among my favorites. Happy reading!