JH Gruger
Award-Winning Hard Science Fiction Author
JH Gruger is an award-winning hard science fiction author specializing in near-future alien invasion thrillers. His debut series, The Sentinel Suppressions, follows humanity's desperate defense against alien Sentinels who attack when human technological and evolutionary advancement threatens the galactic order. Featuring neurodiverse heroes and grounded in real science, his novels—including Gravity of Sol-3 and Tyrants of Gravity—have won multiple awards, including the Literary Titan Gold Medal and Readers' Favorite Bronze Medal
From Vox Proxima Press: Award-Winning Techno-Thrillers that argue, bruise, and burn.
The Sentinel Suppressions: A Near-Future Alien Invasion Series
Hard Science Fiction That Thinks Big. What if the greatest danger to humanity wasn’t on Earth — but from alien sentinels watching from space?
Gravity of Sol-3: Book One
Scott Anderson wants two things: to keep his family alive and to lose himself in the elegant beauty of physics. But the world won’t let him have either. Fascist thugs hunt his neurodivergent family. Eugenicist gatekeepers have corrupted the scientific institutions he hoped would be his sanctuary.
And now, as humanity’s brightest minds edge closer to cracking the secrets of black hole technology, something far more powerful than any earthly enemy has taken notice — alien sentinels in orbit, ancient and impassive, have already decided the penalty for humanity’s ambition. The Sentinels attack with black-hole-powered kinetic weapons and with an insidious extermination of neurodiverse humans. Scott and his autistic brother are running out of places to hide.
Scott’s only hope of survival is to press forward to transform his black hole technology into a weapon of defense.
What readers are saying:
-
“Arthur C. Clarke would have enjoyed this!”
-
"such a fun and captivating read"
-
"Excellent, well-paced, believable storyline. If I could give this 6 stars, I would"
-
"A tense, cerebral tale of rebellion and resilience set in a near-future Earth controlled by alien Sentinels. . . one of the most chilling antagonists I've encountered in recent science fiction."
Tyrants of Gravity: Book Two
Follow humanity’s desperate defense against the alien Sentinels. Scott Anderson defeated the aliens using human scientific, technological, and telepathic advancements. Mankind now stands on the threshold of interstellar space travel with black-hole-powered propulsion technology and planet-killing weaponry, violating the galactic nonproliferation laws.
The wreckage of the alien space battleship drifts in Earth’s orbit. But mankind is unaware that an insidious alien AI remains, infecting social networks and provoking eugenics hatred to exterminate neurodivergent telepathic humans.
The relative peace on Earth is shattered by an approaching extraterrestrial fleet that prepares to launch planet-killers. Scott and his autistic-telepath brother Robby have little time to recognize the threat and develop weapons that counter the advanced technologies and eugenics threat of the Centauran fleet. If they fail, human civilization will be destroyed, and billions will die. The neurodiverse humans hold the keys to survival.
What readers are saying:
-
"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
-
"brilliant . . . A standout work for fans of sci-fi. It invokes the awe of interstellar while maintaining the gritty grounded tension"
NEWS & REVIEWS
Reviews for Tyrants of Gravity:
April 2026 "...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."
January 2026 "Lovers of sci-fi novels blended with adventure, suspense, and action will find Tyrants of Gravity by JH Gruger an enthralling read."
Reviews for Gravity of Sol-3:
-
Literary Titan Silver Book Award:
Fiction - Science Fiction genre
-
Five-Star Review for Gravity of Sol-3 by Readers' Favorite, November 2024
"A tense, cerebral tale of rebellion and resilience set in a near-future Earth controlled by alien Sentinels. . . one of the most chilling antagonists I've encountered in recent science fiction."
-
Editorial Book Review December 2024
"Engineering New Worlds: How JH Gruger Fuses Science & Storytelling in His Sci-Fi Series"
About the Author
JH Gruger is an award-winning hard science fiction author of near-future alien-invasion thrillers. His first two novels, Gravity of Sol-3 and Tyrants of Gravity, have won multiple awards. JH Gruger retired from his career as VP of Computer Engineering to write hard science fiction. He had early-career expertise in the architecture and design of military guidance systems — all of which shows up in speculations on near-future military sci-fi technology.
