Asimov takes time travel to a new level in this short novel. We had had too many loners traveling into past; here we meet an entire organization engaged in doing that and that alone. And not just travel into past, they make changes to the past to get the present that gives (in their opinion) the 'greatest happiness to the greatest number'. This means there is an abundance of realities, each as real to its inhabitants as ours is to us, coming into existence when the current past (whatever that is) leads to it, and going out of existence when past changes again (leading to an alternate reality). Not the best Asimov novel in terms of character development, but readable, and provides quite a bit of food for thought.
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