I Robot is more of a thought exercise in logic than an actual book. I found it fun, but if you want a story-story, you should try Asimov's Fantastic Voyage instead.
The Wikipedia article says that he wrote one that Asimov wrote one that took place in the USSR, essentially a parallel sort of story, and there's mention of a third one where the characters explore an alien corpse, but personally I felt that I got everything I needed from the first book, unless you'd recommend the second book regardless.