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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."
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
Find the Full Series here.
Click here for the full reading guide.
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.
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| Pages |
466 |
| ISBN |
9781789265484 (paperback edition)
|
| Paperback Dimensions |
5 x 0.51 x 8 inches |
| Language |
English |
| Categories |
Thriller · Technothriller · Espionage · Cybercrime · Mystery & Detective · International Crime · Action & Adventure · Women Protagonist · Government Conspiracy · Cryptography
|
| Series |
The Calla Cress Decrypter Thriller Series, Book 3 |
Listen to the series here:
Locations & interesting places in the novel
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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.
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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.
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Central London (Whitehall and Westminster) – The story traverses well‑known government districts as Calla interacts with politicians and security services.
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Colorado, USA – Calla and her team follow a lead to Castle Rock, Colorado, where a Blackhorse facility is located (from chapter headings and timeline).
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Gibraltar – A high‑stakes auction of stolen secrets takes place in Gibraltar, requiring the team to infiltrate a gala and avoid assassins.
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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).
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Munich Residence & Bavarian castle – The climax occurs under a Bavarian castle where the “Digital Eyes Only” server is hidden.
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Cape Wrath, Scotland – A coded reference leads Calla to ISTF’s training facility at Cape Wrath, adding maritime suspense (chapter headings).
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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.
