•
1 34

Silver Gravity Books

The Decrypter and the Kingdom Of Diamonds : The Calla Cress Decrypter Thriller Series, Book 8, Rose Sandy

The Decrypter and the Kingdom Of Diamonds : The Calla Cress Decrypter Thriller Series, Book 8, Rose Sandy

£30.00 GBP
£30.00 GBP
Sale Sold out
Taxes included.
Format

Thriller & suspense, Suspense, Sci-fi, Technology, Action & adventure, Crime & mystery, History, and Romance

Book Number in Series

FREE instant Ebook version with every hardback, paperback or audio sale!

EBOOKS ARE DELIVERED INSTANTLY. YOUR DOWNLOAD LINK ARRIVES BY EMAIL RIGHT AFTER CHECKOUT. PAPERBACKS/HARDBACKS ARE PRINTED TO ORDER AND TYPICALLY SHIP IN 3–7 DAYS.

A brilliant curator. A criminal mastermind. A lost ship that could hold the key to our future... or our demise

When a 17th‑century ship loaded with supernatural diamonds resurfaces in the South African desert, codebreaker Calla Cress races across continents to decode its location and stop a ruthless biotech mogul from weaponizing the stones’ mind‑bending power

Deep in the Kalahari Desert lies a secret that could reshape humanity—a lost ship carrying more than just precious stones. For British Museum curator Calla Cress, decoding its location means stepping back into a life she thought she'd left behind. A life of shadows, secrets, and silent warfare.

But she's not the only one hunting. The ruthless criminal mastermind known as Savant has set her sights on the same prize, wielding the resources of her shadowy organization, Paragon, in a deadly race to claim the ship's mysterious cargo. What begins as a search for diamonds evolves into something far more sinister as Savant's true agenda emerges, something that could change the course of human evolution itself.

Caught in a web of shifting loyalties, Calla must confront her complicated history with Mason Laskfell, her former boss at the agency turned fugitive, whose allegiances remain dangerously unclear. As the stakes escalate, one question becomes paramount: in a game where everyone wears a mask, who can she trust?

Perfect for fans of Tom Clancy's Jack Ryan and Robert Ludlum's Jason Bourne series, The Decrypter and the Kingdom of Diamonds is a high-stakes thriller that weaves together ancient mysteries, cutting-edge science, and the dark underbelly of the international criminal world. In Calla Cress's world, every revelation comes with a price—and some secrets are worth killing for.

Reader Praise

“Fast-paced and cinematic, Calla Cress is back in her most personal and powerful mission yet.”

“Diamonds that whisper, neural tech, and ancient secrets, this one has it all!”

“A must-read for fans of action, mystery, and smart thrillers.”

“Rose Sandy’s best work to date equal parts exciting and thought-provoking.”

Locations & Interesting Places in the Book


Kalahari Desert, Botswana – Hidden caves filled with carbonado diamonds that hum and whisper. The desert becomes the final battlefield for control over humanity’s future.

Cape Town, South Africa – A sleek biotech conference where NS-217 is revealed to the world—and its dangers become terrifyingly clear.

Venice, Italy – A masquerade ball at Aman Canal Grande sets the stage for revelations and betrayals in a city of masks and secrets.

London, UK – From the British Museum to Blackhorse Archives, Calla’s home turf becomes the hub of encoded clues, family secrets, and decisions that shape her destiny.

Vatican City, Rome – Perry Cress executes a daring heist that kicks off the trail toward the Kingdom.

Dubai – A black-market auction where a diamond fragment changes everything.

Khoisan Villages, Botswana – Ancient oral legends, cave paintings and spiritual warnings guard the Kingdom’s truth.

Listen to the series here:

ABOUT THE SERIES

Calla Cress is no ordinary museum curator. By day, she manages ancient manuscripts, Byzantine relics, and rare artifacts at the British Museum. But in the shadows, she’s a top operative, for a covert multi-government spy agency. With unparalleled skills in cryptography, ancient languages, and digital intelligence, Calla is known as The Decrypter,the one they call when the stakes are global and the clues are buried deep in history.

The Calla Cress Technothriller Series

Introduction: The Curator and the Code

Calla Cress is a brilliant curator at the British Museum, a woman whose unparalleled command of history and ancient languages has made her a luminary in the academic world. Her quiet life shatters when she’s recruited to decipher a cryptic, long-lost manuscript written in an apparently unbreakable code. The secrets locked inside are no mere curiosities: they map the location of resources that could make crude oil look obsolete. Thrust from scholarly halls into the shadows of global espionage, Calla learns that priceless artefacts can be triggers for future wars—and her first mission is only the beginning.

The Scope of the Conspiracy: A Global Race Against Time

What starts with a single manuscript escalates into a worldwide battle against a cascade of interlinked threats. The Calla Cress series blends historical mystery, high-stakes international espionage, and cutting-edge technothriller energy. From London and Paris to the deserts of Morocco and the jungles of the Congo, Calla and her allies piece together clues centuries in the making. Hunted at every turn by relentless foes—wielding carbonado diamonds and moving like computer-augmented phantoms—they bend physics and technology to their will. With each book, the stakes rise and the pace accelerates, as Calla uncovers a conspiracy vast enough to bring the world to its knees.

A Promise to the Reader: Unforgettable Adventure

Expect an action-packed ride from first page to last—breathless momentum with brains and heart. Each instalment delivers intricate mystery, breathtaking suspense, and relentless thrills. If you love globe-trotting puzzles, fierce heroines, and technothrillers that never let up, the Calla Cress series belongs on your shelf.

Main Characters

Calla Cress—the series protagonist—is a British Museum curator and ISTF agent on a personal crusade to uncover her origins and the truth behind her genetically enhanced abilities. Facing cryptic codes and dangerous foes, her journey pushes her cyber-espionage skills to the limit. Across the series she evolves into a formidable operative, determined to reconcile the mysteries of her past with her present while battling adversaries who weaponise her own secrets against her.

Jack Kleve is the quintessential ally—a visionary tech entrepreneur and ISTF operative who lends his skills to Calla Cress and Nash Shields. While navigating corporate rivalry and the murky ethics of rapid technological advancement, his arc bends towards recognising the greater good over profit. Jack’s devotion to Calla adds a personal dimension to his conflicts, intertwining the professional with the emotional. His shift from profit-driven inventor to socially conscious partner marks a pivotal transformation in the series.

Nash Shields, an NSA and ISTF agent, is the steadfast protector and love interest, driven by a profound sense of duty. He confronts formidable enemies and complex political networks while safeguarding vital technologies alongside Calla. His journey forces him to question the ethics of his mission, balancing loyalty to his agencies with a deepening moral awareness. Torn between professional duty and personal feelings, Nash walks a precarious line between love and allegiance.

SERIES READING ORDER

The Calla Cress Decrypter Thriller Series In Order

  • Book 1: Secret of the Lost Manuscript
  • Book 2: The Mind Hacker
  • Book 3: Digital Eyes Only
  • Book 4: The Storm’s Eye
  • Book 5: The Pythagoras Clause
  • Book 6: The Beale Ciphers
  • Book 7: Atlantis of the Sands
  • Book 8: Kingdom of Diamonds
  • Book 9: The Falcom Syndrome
  • Book 10: The Queen of Sheba
  • Book 11: The Calculus Warning
  • Book 12: The Cobra Paradox
  • Book 13: Room of Martyrs
  • Book 14: Eiger Mosaic
  • Book 15: Enemy of Wolves
  • Book 16: The Pharaoh's Mask
  • Book 17: The Eternity Hypothesis
  • Book 18: The Sculptor's Code
  • Book 19: The Solomon Agenda
  • Book 20: The Pheonix Cipher
  • Book 21: The Cairo Key
  • Book 22: Red Fox Agenda
  • Book 23: Phaistos Disc
  • Book 24: Scorpion Gold

READ A SAMPLE

Kingdom of Diamonds Book Sample.

Meet the Author

Meet the Author – Rose Sandy

Rose Sandy writes adventure thrillers that blend espionage, technology, and history into fast-paced adventures. Her stories dive into the world of covert intelligence, scientific breakthroughs, and global conspiracies—perfect for readers who love suspense with a twist of "what if?" Whether you're on a morning commute or relaxing on a Sunday, her books promise to entertain, surprise, and transport you to hidden corners of the world.

A true globetrotter and lifelong communicator, Rose draws inspiration from historical archives, cutting-edge tech, and conversations with intelligence insiders. When she's not researching in the British Library or exploring Churchill’s War Rooms, she’s crafting thrillers that weave intrigue, action, and a hint of romance.
Discover more [here] or join her newsletter at subscribepage.io/Wuqko4.

Tropes You'll Love

Lost treasure with supernatural power
Deadly code that only one woman can crack
Neural technology that hijacks free will
Enemies forced to work together
Ancient prophecies tied to DNA
Female-led spy adventure
Secret societies and scientific conspiracies
Betrayal and revenge
Global race against time
Biotech vs. humanity’s soul

Audio Book Sample

Audio book in production.

Other Book Details

Technothriller, Action Adventure, Genetic Engineering, Archaeological Mystery, Espionage, Conspiracy Thriller, Women’s Adventure, Science & History Crossover, Global Mystery

FAQs

View full details
1 2