Silver Gravity Books

The Decrypter and the Queen of Sheba: The Calla Cress Decrypter Thriller Series, Book 10 - Rose Sandy

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Suspense, Thriller & suspense, Action & adventure, Technology, History, Arts, Business, Crime & mystery, Family, Fantasy, Horror, Sci-fi, Travel, Western, and Romance

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Ancient secrets. Global stakes. A cipher that controls the world's wealth.

When a cache of stone tablets surfaces containing fragments of the legendary "Sheban Cypher", a mathematical system said to have given the Queen of Sheba unprecedented control over ancient trade routes, cryptographer Calla Cress finds herself drawn into a high-stakes race against time.

What begins as an archaeological curiosity quickly escalates when Calla discovers the cipher isn't just historically significant, it's the mathematical key to controlling modern global shipping lanes worth trillions. As competing expeditions converge on the lost city of Sheba, Calla experiences inexplicable visions of desert caravans and ancient guardians that suggest her connection to the cipher runs deeper than professional interest.

Teaming up with security specialist Nash Shields, whose quantum approach to cryptography clashes with her traditional methods, Calla must navigate treacherous desert landscapes while staying one step ahead of Marcia Al-Zahir, a ruthless shipping magnate already implementing fragments of the cipher to manipulate world markets.

But the greatest threat may come from the shadows, where the enigmatic operative Vortigern has been monitoring Calla's bloodline for decades, convinced she holds the inherited key to unlocking the cipher's full potential. As global shipping descends into chaos and markets teeter on collapse, Calla uncovers an earth-shattering secret: her parents once traveled these same deserts, possibly hiding a child with the same guardian abilities she's now manifesting.

From London's cryptographic labs to the wind-swept ruins of ancient Yemen, Calla must decipher not only the Queen's mathematical legacy but also her own mysterious heritage before Vortigern can harness the cipher for world domination. The final key to saving global trade might lie not in the ancient stones but in Calla's very blood—and the child she never knew existed.

The Queen of Sheba is the tenth pulse-pounding installment in the acclaimed Calla Cress Decrypter series, perfect for fans of James Rollins, Clive Cussler, and Dan Brown.

Listen to the series here:

ABOUT THE SERIES

The Calla Cress Decrypter Thriller Series

Unlock the Code-Cracking Thrills of the Calla Cress Decrypter Series

Step into the action-adventure cyber-thriller universe where ancient secrets fuel tomorrow’s digital wars. Calla Cress, British Museum curator by day, elite code-breaker by night, stands between ruthless hackers and total network domination. From the shadowy corridors of London’s tech, secret agency underground to clandestine data bunkers half a world away, Calla unravels encrypted puzzles that could rewrite history … or end it.

Perfect for readers who devour technothrillers, spy fiction, and historical mysteries, each book in the Decrypter Series fuses real-world hacking, lost artifacts, and high-octane action into an addictive ride you won’t put down. Join Calla on her globe-trotting missions, decode the conspiracies, and discover why fans call her “the smartest heroine in cyber-espionage fiction.”

Crack the first cipher today and dive into a series where every chapter raises the stakes—and the heartbeat.

SERIES READING ORDER

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

READ A 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.