The sci-fi elements of time travel are great in this novel. Imaginative, well thought-out and captivating. The characters are classic Asimov from the 50’s, a bit blank and cliched. But the pace is good, the story has a couple of nice twists and the little echo to the Foundation series in nice. In terms of sheer sci-fi, it is probably his best novel (from what I have read anyway).

It is dated, both in its treatment of female characters (although the ending alleviates that a bit) and obsession with nuclear war. But it didn’t prevent me from enjoying the book greatly, it is a product of its time and one should accept that.

It gets 4 starts instead of 5 because I wasn’t as taken by I as I was by some of his other novels. But I still recommend it very much.