Asimov's short stuff is much better than his novels. It's not SF, but you might try his Black Widower stories, I think there are 3 or 4 collections of them, th

Asimov's short stuff is much better than his novels. It's not SF, but you might try his Black Widower stories, I think there are 3 or 4 collections of them, they're short brain-teaser stories.