I remember thoroughly enjoying this book as a teenager. Whether I would have enjoyed it so much if I knew it was cobbled together from three completely unrelated novelettes I couldn't really say. ( )

Perhaps the most complex time travel book I've ever read. I recommend for those who like complicated plots. It has a nice twist at the end. ( )

Not the greatest book in the world, certainly not the greatest science fiction. It has 3* though, because it is the cleverest time travel book I ever read - trying to follow all the twists and turns of the plot as it dodges in and out of one time after another, one probability after another, is very difficult. I only managed it on about my fifth read! ( )