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The Sentinel Suppressions Series Book Two

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

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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Book Cover for Tyrants of Gravity
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© 2026 by JH Gruger

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