A U T H O R S N O T E

This book is not part of the Foundation Series, the Robot Series, or the Empire Series. It stands independently. I just thought I'd warn you of that to avoid misapprehension. Of course, I might someday write another novel tying this one to the others, but, then again, I might not. After all, for how long can I keep flogging my mind to make it work out these complexities of future history?
Another point. I made up my mind long ago to follow one cardinal rule in all my writing—to be clear. I have given up all thought of writing poetically or symbolically or experimentally, or in any of the other modes that might (if I were good enough) get me a Pulitzer prize. I would write merely clearly and in this way establish a warm relationship between myself and my readers, and the professional critics— Well, they can do whatever they wish.
However, my stories write themselves, I'm afraid, and in this one, I was rather appalled to find out that I was writing it in two strands. One set of events was taking place in the story's present, and another set was taking place in the story's past, but steadily approaching the present. I am sure you will have no trouble following the pattern, but since we are all friends, I thought I would let you know.