Silver Gravity Books

The Decrypter: Digital Eyes Only: The Calla Cress Decrypter Thriller Series, Book 3 - Rose Sandy

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

Book Number in Series

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Facing a foe who blurs reality, she must trust in what she cannot see to expose the truth.

From MI6 secrets to the missing ending of the Bayeux Tapestry, nothing is safe when the Blackhorse Group starts selling history—and Calla Cress is the only one who can stop them.

As tensions rise between nations and the threat of a cyber war looms on the horizon, one woman finds herself at the center of it all. Calla Cress, a museum curator turned cyber defense agent, is called upon to decrypt a mysterious cipher found at the home of the British prime minister. But as she delves deeper into the case, Calla realizes that this is just the tip of the iceberg.

A hi-tech encrypted device containing codes for far-future technologies has been stolen from the NSA's vault of secrets, and it appears that the perpetrators are planning to sell the valuable information on the darknet. Dubbed the Vault, this shadowy corner of the internet is shrouded in mystery, with ties to the mysterious history of the Maltese Knights.

As Calla and NSA agent Nash Shields race to unravel the Vault's web of secrets and stop the sale of the NSA list, they find themselves pulled into a dangerous game of espionage that stretches from the streets of London to the coves of Malta, and even the glitzy allure of Monte Carlo. But the closer they get to their goal, the more Calla realizes that the price of success may be higher than she is willing to pay.

Escape into a heart-racing, action-packed adventure with this must-read thriller that fans of Jason Bourne, Scott Mariani, Steve Berry, The Matrix and Clive Cussler will love.

If you're into intelligent, modern techno-thrillers woven with cryptic puzzles, real-world tech, international intrigue, and a fierce female lead, the Decrypter series delivers.

Reader Praise

"Calla Cress stole my heart—brilliant, brave, and deeply human. I couldn’t put this book down."

"Smart, slick, and seriously addictive. This is the spy thriller I didn’t know I needed."

Listen to the series here:

Locations & interesting places in the novel

Massachusetts Institute of Technology (MIT), USA – The prologue takes place at MIT fifteen years before the main events, involving twin sisters experimenting with dangerous substances.
Chelsea & 10 Downing Street, London – Calla’s apartment and the Prime Minister’s residence. She is summoned to 10 Downing Street to view the encrypted email.
Central London (Whitehall and Westminster) – The story traverses well‑known government districts as Calla interacts with politicians and security services.
Colorado, USA – Calla and her team follow a lead to Castle Rock, Colorado, where a Blackhorse facility is located (from chapter headings and timeline).
Gibraltar – A high‑stakes auction of stolen secrets takes place in Gibraltar, requiring the team to infiltrate a gala and avoid assassins.
Berlin, Germany (Gendarmenmarkt) – The plot takes the characters to Berlin for intel and to track the movement of the “Digital Eyes Only” file (chapter headings).
Munich Residence & Bavarian castle – The climax occurs under a Bavarian castle where the “Digital Eyes Only” server is hidden.
Cape Wrath, Scotland – A coded reference leads Calla to ISTF’s training facility at Cape Wrath, adding maritime suspense (chapter headings).
Caribbean island (Baie Rouge) – Nash waits for Calla in St. Martin, symbolising her desire for a peaceful life. She later returns here to recover after the mission.

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

READ A SAMPLE

DIGITAL EYES ONLY SAMPLE

Meet the Author

Meet the Author Rose Sandy

Rose Sandy writes 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

Action-packed female lead, cyber espionage thriller, international high-stakes conspiracy, secret societies and covert agencies, museum curator turned spy, encrypted messages and puzzles, stolen artifacts and ancient secrets, techno-thriller with a global chase, pregnant heroine in danger, enemies within the government, found family in intelligence networks, for fans of Jason Bourne meets Da Vinci Code.

Audio Book Sample

Book in production.

Other Book Details

Thriller · Technothriller · Espionage · Cybercrime · Mystery & Detective · International Crime · Action & Adventure · Women Protagonist · Government Conspiracy · Cryptography