Lucky Starr and the Rings of Saturn by Paul French (Isaac Asimov)
Hardcover: Doubleday, $2.75, 179pp, 1958
The Rings of Saturn is the last Lucky Starr book, though it’s not the final one. Isaac Asimov had a notion to write Lucky Starr and the Snows of Pluto but he switched to primarily writing non-fiction and there were never any more Lucky Starr books. That makes this the sixth of seven novels which introduces a third wheel while asking two key questions in a milieu which includes fifty outer worlds and the Three Laws of Robotics.
The plot involves the Earth Council discovering “Agent X,” a spy for the most anti-Earth outer world, Sirius, and sending ordinary ships out in pursuit after Agent X blasts his way out of Mos Eisley spaceport. Of course, these ships are not up to the task, but Lucky Starr and his big-in-spirit companion, Bigman Jones, take their snazzy supership out and go on an exciting chase to Saturn  where Agent X jettisons a capsule of the stolen plans to the Death Star and is destroyed by an unlucky connection with some space junk. However, it is then revealed that the Sirians have established a base on Titan, claim it as their own territory, and warn Lucky off. He does retreat, only to hide by an asteroid and pick up Wess, a fellow Councilman, before detaching (somewhat like the Falcon floating away with the Star Destroyer’s garbage). Even so, the Sirians have some spiffy mass detectors and track Lucky’s ship as he ducks into the Cassini Division and then crashes into the snowball of Mimas. (Actually, he burns his way in with a fusion beam.) Still, the Sirians persist, so the trio set up a base, leave Wess behind (Lucky tries to get Bigman to stay behind, too, but predictably fails) and then Lucky surrenders. A conference has been set up at which the fifty worlds and Earth will decide if solar systems are indivisible territorial units (as has been the previous assumption and is still Earth’s position) or if Sirius’ new definition of any uncolonized world being up for grabs will hold. After Lucky’s surrender, evil Sirian Sten Devoure’s plan is to kill Bigman in some excruciating way if Lucky doesn’t agree to be taken to the conference and confess his war crimes of invading Sirius’ world of Titan. Much derring-do still results in Lucky agreeing to go to the conference but, rather than telling Sirian lies for them, he instead agrees to reveal Wess’ presence in exchange for Bigman’s life. Both Bigman and a couple of more honorable Sirians are dismayed at Lucky’s moral failure but take Lucky to Vesta for the climactic conference (which turns into a sort of trial) in which all appears lost.
In this one, Lucky and Bigman’s relationship (in which an adult male is repeatedly tousling another adult male’s hair and so on) still bugs me, Sten Devoure is as melodramatic a black hat as his name suggests, there are many contrivances including the mass detectors, the Sirian robots’ limitations (especially including the “battle stations” gimmick), and Lucky’s habitual silence about his clever plans until the end, and the climax is too easy for all the big todo that led up to it. On the other hand, there are exciting scenes, some of the space combat (with a “pea-shot” vs. “grape-shot” and the light speed delays) are similar to Jack Campbell’s Lost Fleet space fights, the interstellar politics near the end have an almost Foundation-like feel, and the courtroom scene (and, obviously, the robots themselves) have a Robot-like feel. In addition to the interesting notion of stellar territorial definitions, this also finally raises (though it does not satisfactorily answer) what being “human” is and how robots  recognize it in the context of their Three Laws (dramatized by the racialist Sirians ordering their robots to kill the small, subhuman Bigman Jones). Related to this, Asimov specifically has Lucky make the case for the advantages of diversity.
Looking at this book as part of the whole series, I’d say that certain melodramatic aspects and repeated motifs drag this one down but some of its questions and exciting scenes lift it up to place it on par with most of the rest. Though it is clear there could be more stories in the series (with one Sirian brought into the Earth fold and intimations that Devoure and Lucky will tangle again and with the Earth-Sirian cold war still ongoing rather than being ended in some sort of climactic grand finale), it doesn’t end on a cliffhanger, either, so makes a decent close to the series.
 The depiction of details of Saturn, its rings, and its moons are no longer completely accurate, but they are reasonable and it shouldn’t cause much of a problem for anyone.
 Interestingly, Lucky’s cosmopolitan admiration of the “human” accomplishment of the “Sirian” robots seems to echo Asimov’s presumed admiration of the Soviet Sputnik and, while he doesn’t mention that directly anywhere that I know of, this book was written from November 1957 to February 1958, after Sputnik went up in October 1957. (This scientific event may also have played a role in Asimov’s change of focus after this novel from science fiction to mostly scientific non-fiction.