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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.

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.

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