Silver Gravity Books

The Decrypter and the Atlantis of the Sands: The Calla Cress Decrypter Thriller Series, Book 7, Rose Sandy

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

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The legends were true... and the consequences could be catastrophic.

When a coded manuscript tied to the lost city of Iram resurfaces and chaos happens across ancient sites, codebreaker Calla Cress races from Crete to Berlin to the Arabian desert to rescue her kidnapped mentor, decode a dead language and prevent a ruthless corporation from weaponising the secrets of the Atlantis of the Sands.

Ten years ago, a young operative broke into Britain’s most secure facility and stole a leather‑bound book filled with an unknown script. Its blank pages pulse with a power tied to an ancient city said to have been swallowed by the desert.

Now, codebreaker Calla Cress receives the same book – and an urgent plea from her former mentor Professor Octavia Steward. Octavia has vanished after revealing artefacts from Iram, the legendary Atlantis of the Sands. Armed with nothing but seven blank pages and her talent for deciphers, Calla must race across continents to decode a dead language and stop a series of bombings targeting ancient sites.

From the ruins of Knossos to the museums of Berlin and the shifting dunes of the Rub’ al Khali, Calla and her team – ex‑Marine Nash Shields and tech genius Jack Kleve – confront secret societies, ruthless mercenaries and a biotech corporation that sees Iram’s mysteries as the key to unimaginable power.

She is haunted by a past expedition to the Arabian desert where an unseen language and collapsing quicksand nearly cost a man his life. The same code now triggers bombs around the world. To solve the puzzle, Calla must unearth the truth about Kronos Genetisys, the shadowy company funding the dig, and decide whether to trust her father’s clandestine Blackhorse Group.

As ancient myth collides with modern terrorism, Calla discovers that the city of pillars hides not only treasures but technology far beyond its time. The secrets in the sand could heal the world or ignite it.

In this electrifying techno‑thriller, Rose Sandy blends archaeological adventure, cyber‑espionage and a pulse‑pounding romance into a story that pits human curiosity against the perils of unfettered science. Fans of Indiana Jones, Tomb Raider and The Da Vinci Code will be captivated by a heroine who must decode history to save the future

Fans of Lara Croft, James Rollins, and Dan Brown will love this pulse-pounding technothriller where archaeological myth meets cyber-espionage and romantic suspense.

Reader Praise

“Explosive, gripping, and mind-twisting—Calla Cress is the heroine thrillers have been waiting for.”

“Equal parts ancient mystery and modern thriller, this book is hard to put down.”

“I couldn’t stop turning the pages—every chapter ups the stakes!”

“A fast-paced treasure hunt with brains, beauty, and danger in every location.”

Locations & Interesting Places in the Book

Knossos Palace, Crete – The site of ancient ruins targeted by enemies encoded in extinct languages.

Berlin, Germany – Location of Professor Octavia Steward’s live television abduction and secret cryptographic vaults beneath museums.

Rub’ al Khali (Empty Quarter), Saudi Arabia/Oman – The fabled location of Iram, the Atlantis of the Sands.

Cheltenham, UK – GCHQ Headquarters – Where an operative once stole the encrypted manuscript that now holds the key to Iram.

London – II Temple Place & Blackhorse Archives – Headquarters of a shadowy group concealing truths about Calla’s past.

Muscat, Oman – Staging ground for the desert expedition with help from Sheik Amir Salib.

Cambridge University – Where Calla’s relationship with her mentor began—and where the tragedy of Ivan Schneider was born.

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

Atlantis of the Sands 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 civilisation & forbidden technology
Dead language and cryptographic puzzles
Female-led international thriller
Enemies-to-allies and secret societies
Mentor abduction and shadow conspiracies
Race against time to save the future
Desert ruins, hidden vaults and ancient codes
Trauma, redemption and a second chance
Global chase through Crete, Berlin, and the Arabian desert
Romantic tension under fire

Audio Book Sample

Other Book Details

Technothriller, Archaeological Adventure, Ancient Civilizations, Espionage, Women’s Fiction, Science Fiction Thriller, Global Mystery, Romantic Suspense