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The Sentinel Suppressions Series

Feral science fiction. "For readers who want their science fiction to argue, bruise, and burn. Tyrants of Gravity is a sci-fi novel that thinks big and hits with surprising heart." - Literary Titan

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Gravity of Sol-3

“Arthur C. Clarke would have enjoyed this!”

“a great sci-fi read. . . on the cusp of a dystopian Earth with secret alien overlords”

 

​“lived rent-free in my head for weeks when I was done”

 

"such a fun and captivating read"
 
"modern sci-fi written so well I got lost in the emotions and events happening in each chapter they feel so real"


"Excellent, well-paced, believable storyline. If I could give this 6 stars, I would".

-Amazon Reviewers

Scott Anderson never asked to be a revolutionary. He only wanted a quiet life surrounded by equations, far from the political violence tearing his world apart. But when fascist forces begin targeting his family, Scott is forced to flee everything he knows — trading safety for survival and stumbling headlong into a scientific research project where the most brilliant physicist alive is pushing humanity toward a discovery that could change everything.


The problem? Someone — or something — has already decided that humanity isn't ready.


The alien sentinels have watched Earth for over a hundred years. Their directive is simple and merciless: no species advances primordial black hole technology. The rules aren't negotiable. Prevention is insidious. Violations bring swift enforcement. Orbital bombardments rain down on research facilities, silencing physicists who come too close to the truth. Scott finds himself caught between earthly fascists and cosmic enforcers, forced to ask a terrifying question — in a universe governed by power, is the pursuit of knowledge itself an act of war?

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Tyrants of Gravity

"brilliant . . . A standout work for fans of sci-fi. It invokes the awe of interstellar while maintaining the gritty grounded tension"

"I read it in just a few days because I couldn't stop turning pages. If you like hard sci-fi with strong characters and a fresh take on alien/AI threats, grab this one. "

"a first-rate example of an exceptional, exciting sci-fi thriller"

-Amazon Reviewers

 

Alien attacks on Earth have failed, defeated by human advances in physics and telepathy. But a Centauri fleet near the Sol system reacts with fury, determined to find out why a routine Sentinel Suppression mission failed, and capture and eviscerate the captain who betrayed them.

 

Two autistic boys, Robby and Luca, search for their lost parents—lost in the dystopia created by the alien attacks. But the rogue alien captain, Cap, is thrilled by the emergence of the boys’ telepathy mutation and helps them in their quest.

 

Scott Anderson, Robby’s physicist brother, joins the Space Force weapons development team to defend against the approaching alien fleet. But man’s technology that harnesses the energy of primordial black holes is primitive compared to the Centauri fleet’s weapons.

 

Centauri warships launch kinetic energy projectiles and planet killers, forcing a frantic search for weapons to defend Earth. Scott’s and Robby’s telepathic collaboration with the alien captain is the key to devising weapons effective against the Centauris—the only hope for man’s survival.

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© 2026 by JH Gruger
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