Silver Gravity Books

Project Horizon: The Nash Shields Thrillers, Book 3 - Rose Sandy

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Action & adventure, Sci-fi, and Thriller & suspense

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He only needed one day. So did they.

In the shadow world of covert intelligence, time is the ultimate enemy.

KJ20-Ops agent Nash Shields is a lone wolf for a reason—trust gets you killed. When he stumbles upon an abandoned file in a forgotten NSA vault, he uncovers the impossible: blueprints for technology that can open doorways to parallel universes. Technology worth billions... and capable of causing catastrophic glitches in reality itself.

But Nash isn't the only one hunting this power. Mason Laskfell, a ruthless rival from Nash's past, will stop at nothing to harness the technology's reality-bending potential. When Mason kidnaps Nash's former partner and the brilliant curator Calla Cress, the stakes become brutally personal.

Now Nash must assemble an unlikely team, including his one true friend, tech genius Jack Kleve, to mount a desperate rescue mission. From London's shadowy underbelly to ancient stone monuments in the remote Orkney Islands, from the frozen wastelands of Svalbard to a final confrontation in the Arctic Circle, Nash's team races against the clock to prevent reality itself from unraveling.

For Nash, success means confronting the one thing he's avoided his entire career: absolute trust in others. In a world where reality can glitch and enemies become phantoms that walk between worlds, Nash must overcome his deepest fears to save not just those he cares about, but existence itself.

Project Horizon delivers heart-pounding action, mind-bending sci-fi concepts, and shocking revelations that will leave readers questioning the very nature of reality itself. The most explosive installment yet in the acclaimed parallel universe series.

ABOUT THE SERIES

About the Series

The story before the Decrypter. The action before the chaos. The agent behind the missions.

The Nash Shields Thrillers follow Nash Shields — a fearless, relentless Marine-turned-NSA agent recruited into KJ20-Ops, a black-ops unit tasked with retrieving technologies that are far too dangerous to land on the open market. Long before Calla Cress was pulled into global conspiracies, Nash was already running covert ops, facing off with experimental science, and shutting down enemies with international reach.

Each book delivers high-velocity action, cutting-edge tech, and global stakes — with a growing emotional thread as Nash’s missions intersect with Calla and the wider Decrypter universe. By Book 4, the mission stops being “recover this tech” and becomes “protect the woman everyone wants to weaponise.”

Perfect for readers who love The Decrypter Series and want to see the black-ops side of that world.

SERIES READING ORDER

Series Reading Order

Helium Heist (The Nash Shields Thrillers – Book 1)

Nash races to secure Helium-3 — a rare isotope with the power to change the global energy game — and uncovers a conspiracy that reaches far beyond a single heist.
Fallen Game (Book 2)

Assigned to protect a researcher working on a breakthrough in longevity science, Nash must stay ahead of rival players who will kill to own the tech.
Project Horizon (Book 3)

Abandoned blueprints for parallel-universe infiltration surface. Nash is sent to retrieve the volatile tech before it sparks a global incident.

4. Against the World (Book 4)

Now on the run with Calla, Nash faces enemies who want to exploit her rare gifts. The mission shifts from extraction… to protection.

READ A SAMPLE

Book in production.

Meet the Author

Rose Sandy is the international bestselling author of The Decrypter Series, known for adrenaline-fuelled thrillers where espionage, technology, and hidden histories collide. Her stories travel the world, blend real-world science with page-turning suspense, and centre capable protagonists caught in global power plays.

With the Nash Shields Thrillers, she expands the same universe — showing the covert operations, experimental tech, and black-ops missions running alongside Calla Cress’s adventures. If you love fast-paced action, smart science, and interconnected storyworlds, this series sits right beside her flagship novels.

Tropes You'll Love

Elite/black-ops operative (Marine → NSA → KJ20-Ops)
“Too dangerous for normal agencies” tech-recovery missions
Government/agency secrets and “who can we trust?” vibes
Direct crossover with Calla Cress / The Decrypter (same universe, earlier timeline)
Protector/bodyguard energy in the later book(s)
International thriller settings (UK, Europe, remote hideouts)
High-concept science and plausible future tech

• • Recurring team/ops characters — that “shared universe” feel

Audio Book Sample

Book in production.

Other Book Details

nash shields thrillers, rose sandy thrillers, decrypter prequel series, tech espionage thriller, black ops action thriller, female-forward spy fiction, clean energy conspiracy, sci-fi action adventure, silver gravity books thrillers, international suspense series