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The deadliest code isn't digital—it's biological.

When a lethal bioweapon codenamed "Cobra" is unleashed in Paris's black market, cryptographer Calla Cress faces her most dangerous mission yet. This isn't just a virus, it's an adaptive entity that grows stronger with every attempt to neutralize it. The ultimate paradox: fighting it only makes it deadlier.

As infected victims worldwide develop disturbing symptoms and digital patterns form beneath their skin, Calla discovers the terrifying truth, the virus bridges biology and technology, carrying an ancient consciousness with modern ambitions. Behind this unprecedented threat stands Riyaad Kamal, a brilliant biotech engineer with connections to the shadowy operative world that Calla herself descends from.

Racing against a 72-hour deadline before Kamal's global activation sequence triggers worldwide catastrophe, Calla must navigate Paris's treacherous underworld with her team: the fearless former NSA operative Nash Shields, whose personal stake in this mission runs deeper than anyone realizes; tech genius Jack, who risks everything to infiltrate enemy territory; and the determined agent Marrees, whose diplomatic skills hide unexpected talents.

As Calla's unique abilities evolve—allowing her to sense the virus's adaptive patterns in real-time, she uncovers a shocking connection between the ancient Egyptian serpent cults, her own ancestral lineage, and a mysterious pregnancy that ended all too abruptly. The key to stopping the pandemic isn't destroying the Cobra, but communicating with it, a task only Calla can accomplish, if she's willing to risk her very identity.

From Cairo's ancient temples to ultramodern research facilities hidden in the desert, THE COBRA PARADOX delivers heart-pounding action, mind-bending science, and emotional depth as Calla confronts enemies both human and otherwise. With each page, the stakes climb higher, building to a climactic confrontation where the fate of humanity hangs in the balance, and where victory might demand the ultimate sacrifice.

In this electrifying new installment of the internationally bestselling Decrypter series, Rose Sandy weaves cutting-edge biotechnology with ancient mysteries, creating a thriller that will keep you turning pages long into the night.

Sometimes the only way to defeat the darkness is to speak its language.

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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