JH Gruger
Award-Winning Hard Science Fiction Author

What if the greatest danger to humanity wasn’t on Earth — but from extraterrestrial sentinels watching from space?

JH Gruger’s award-winning hard science fiction series, The Sentinel Suppressions, follows humanity’s desperate defense against alien Sentinels who attack Earth when human advancements threaten the galactic order.

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In Book One, Gravity of Sol-3, 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.

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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 skies are no longer safe. And Scott and his autistic brother are running out of places to hide.

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Scott’s only hope of survival for all of mankind is to press forward to transform black hole technology into a weapon of defense.

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Book Two of The Sentinel Suppressions, Tyrants of Gravity, follows 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.

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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.

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However, an approaching extraterrestrial fleet is preparing 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.

Neurodiverse humans have the keys to survival.