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Ancient codes. Modern science. The secret to eternal life.

In the shadowy world where codebreakers reign supreme, one ancient diary threatens to rewrite the laws of human mortality, and everyone is willing to kill for it.

When brilliant ISTF codebreaker Calla Cress receives a cryptic message from her colleague Thomas "Triple X" Xavier about a mysterious Renaissance diary, she's thrust into a high-stakes race against a ruthless adversary. The diary contains more than just history—it holds the genetic blueprint for immortality, created by a secret society of chemists centuries ahead of their time.

As Calla and her elite team peel back the diary's layers of impossible codes, corporate titan Kenzel mobilizes his vast resources to seize the diary's secrets. With his son's life hanging in the balance, his desperation makes him the most dangerous kind of enemy—one with nothing to lose.

When Kenzel kidnaps renowned geneticist Dr. Elizabeth Smith to unlock the diary's final secrets, the game changes. Now Calla isn't just chasing codes—she's hunting a predator while protecting knowledge that could transform or destroy humanity.

The Decrypter and the Falcon Syndrome fuses cutting-edge genetics with ancient cryptography in a pulse-pounding thriller where the line between savior and destroyer blurs with every decoded symbol. This is high-concept suspense that delivers intellectual thrills alongside breathless action, perfect for readers who demand smart, sophisticated adrenaline.

In The Decrypter and the Falcon Syndrome, Rose Sandy presents a chilling glimpse into a future where memory is currency, identity is fluid, and truth is up for grabs.

Reader Praise

“A visionary thriller that makes you question what’s real and what’s programmed.”
“Fast-paced, intelligent, and frighteningly plausible.”
“Calla Cress faces her most psychological and personal mission yet.”
“Mind-blowing twists and jaw-dropping science—this one lingers long after the last page.”

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

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.

Tropes You'll Love:

Memory hacking and mind control
Female-led espionage thriller
Ancient scrolls with futuristic implications
AI vs human intuition
Psychological manipulation
Conspiracy in world governments
Race against time
Identity theft and false memories
Secret societies guarding mental tech
Rewriting history through tech

READ A SAMPLE SOON

Locations & Interesting Places in the Book

Zurich, Switzerland: The story opens at a peace conference where global leaders begin to behave erratically—after a covert neural attack.

Jerusalem, Israel: Home to the Falcon Scrolls, hidden beneath catacombs and guarded by an ancient order.

British Library, London: A digitised manuscript reveals truths about memory corruption and AI evolution.

Doha, Qatar: A data hub for neurological warfare, where FALCON’s code takes shape.

Oxford, UK: Academic cover-ups and a neuro-lab hold secrets from Calla’s past that may unlock everything.

Tel Aviv, Israel: A covert facility reveals the link between the ancient scroll and the modern mind weapon.

Listen to the series here: