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The Eschaton Series: A far-future series featuring UN weapons inspector Rachel Mansour and Martin Springfield, set in a universe where a godlike AI called the "Eschaton" has spread humanity across the stars.
"Missile Gap", a novella combining the Cold War and the late Space Age with science and a bit of the fantastic. To say too much about the plot would be to give it away.
Tropes in his other works:
Airborne Aircraft Carrier: The ekranoplan aircraft carrier from "Missile Gap" technically counts. (Ekranoplans are ground-effect-vehicles, and thus fly only at very low altitudes.)
Antiquated Linguistics: The story "Trunk and Disorderly" is set in Modern Times (centuries after the near-collapse of the human race) but is written in the barbaric yet spiffing idiom natural to the early 20th Century master P. G. Wodehouse; enough to drive a cove near to distraction, as Uncle Philpott once remarked. (Additionally, there exists a Dalek.)
Deadly Graduation: The Hugo-winning novella "Palimpsest" has a unique variation: the final test for a time agent is to go back in time and murder yourself.
Domed Hometown: In the Cthulhu MythosAlternate History short story, "A Colder War", the last survivors of the human race eke out their existence in XK-Masada, a city on an alien planet built beneath a mile-high dome designed by Buckminster Fuller.
Fate Worse Than Death: In "A Colder War", everybody the eater of souls devours is still conscious. In its own words:
"There is life eternal within the eater of souls. Nobody is ever forgotten or allowed to rest in peace. They populate the simulation spaces of its mind, exploring all the possible alternative endings to their life. There is a fate worse than death, you know.''