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.”
The Calla Cress Decrypter Thriller Series Reading 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 Falcon Syndrome
Book 10: The Queen of Sheba
Book 11: The Calculus Warning
Book 12: The Cobra Paradox
Book 13: The Room Of Martyrs
Book 14: The Eiger Mosaic
Book 15: Enemy of Wolves
Book 16: The Pharaoh's Mask
Find the Full series here.
Click here for the full reading guide.
Find the Full Series here.
Click here for the full reading guide.
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
READ A SAMPLE
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.
Buy from Other Retailers Here
| Pages |
510 |
|
Paperback ISBN
|
TBA
|
| Paperback Dimensions |
5 x 0.51 x 8 inches |
| Language |
English |
| Categories |
Technothriller, Action Adventure, Genetic Engineering, Archaeological Mystery, Espionage, Conspiracy Thriller, Women’s Adventure, Science & History Crossover, Global Mystery
|
| Series |
The Calla Cress Decrypter Thriller Series, Book 8 |
