I inadvertently picked up the second book of a series, having never read Caves of Steel
There has been a murder on Solaria, a world where the robot servants so outnumber the humans that the humans rarely see one another. The victim's wife was in the house, no one else was within miles, and the robots could not have done it, could they? So why do the Solarians need a detective all the way from Earth to puzzle out what happened?
I will start by saying that it is hard for a murder mystery to get that 4th star. That element of suspense falls when you already know the ending.
We have here a sci-fi murder mystery. We are investigating a crime, but we are also investigating a foreign society. This is the more extreme version of the detective working abroad, having as much difficulty navigating the culture as the criminal investigation.
Being Asimov, it is written well. Isaac Asimov produced quality prose at a pace faster than most printing presses. This is not the best example of his work, but it is not a bad example.
As a story, the structure is standard. Introduce the detective, give him a partner so that ideas can be explained aloud, present the crime and its impossible circumstances, develop suspects and circumstances while placing the detective in harm's way, moment of epiphany, and bring everyone together for the big reveal at the end. This is effective but not highly original use of the conventions of the genre. You can also see from the chapter structure how the story was originally serialized, with moments like the commercial breaks in a television investigative drama.
The major points of the book are sociological and psychological. The important thing is the exploration of what it means for a culture to grow in the direction that Solaria had or that Earth had. In many ways, this is the essence of science fiction: not the trappings of robots and spaceships, but the effects of taking a trend and letting it play out fully.
The robots are important not as a spectacle but rather as a plot device. Their programming allows rules for the game, a structure for the murder mystery where how some "people" will act is explicitly defined. Most of the robot stories involve defining the limits of robot behavior through the Three Laws then finding ways around them. Having robots lets us explore what it means to be human and how we define consciousness, along with a world where there is no poverty or suffering because technology has allowed everyone to live a life of leisure.
In that respect, the trappings of science fiction are minimal. Yes, we have globe-spanning cities, a trans-galactic confederation, spaceships, robots, holograms, fetal engineering, social conditioning, and everything you expect except lightsabers. They are just the window-dressing for the story. You could very easily adapt the story to Tibet, with pacifist Buddhist monks replacing robots.
This is a great strength of well-written science fiction and fantasy: the ability to explore a principle with greater clarity by abstracting it from its particulars. Several of the robot stories ask how you feel about paternalism when your robot servant/overlords really do know better than you and always have your best interests at heart. What is justified in war when the enemy really is an irredeemably evil other? What do you do when the literal end of the world is nigh?
(Of course, many authors instead make thinly veiled allegories about contemporary politics, where their enemies really are planning to destroy the world. But I digress.)
One theme that recurs in Mr. Asimov's writing is controlling changes in desires. The robots form a permanent slave class, but that is okay because they are perfectly happy with that and they are physically incapable of wanting to be anything else but your perfectly well-meaning servant. Or is there something wrong with building willing slaves? What if we bred them instead? There are shades of Brave New World
It's a good story. It is not a life-altering piece of literature that will be cherished for millennia, but it compares favorably with watching another episode of Law & Order.
Amazon link