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Silver Gravity Books

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The Decrypter: The Atlantis of the Sands: Rose Sandy, Calla Cress Decrypter Thriller Series, Book 7

Thriller & suspense, Technology, History, Romance, Crime & mystery, Action & adventure, and Suspense

Every Silver Gravity story centres women with agency.

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The legends were true. And the consequences could be catastrophic.

A leather-bound book stolen from Britain's most secure facility. Pages that appear blank — yet pulse with a force tied to a lost desert city swallowed by the sands three thousand years ago.

When the book lands in Calla Cress's hands alongside a desperate message from her vanishing mentor, she has hours before ancient sites begin to fall. Someone has decoded enough of Iram's secret to use it as a weapon. Calla must decode the rest before they do.

From the ruins of Knossos to the cryptographic vaults beneath Berlin's museums, from GCHQ in Cheltenham to the shifting dunes of the Rub' al Khali, Calla and her team race against mercenaries, secret societies, and a biotech corporation that will stop at nothing to control what the City of Pillars holds.

The secrets in the sand could heal the world — or ignite it.

"Explosive, gripping, and mind-twisting — Calla Cress is the heroine thrillers have been waiting for." — Max M.
"Equal parts ancient mystery and modern thriller, this book is hard to put down." — Sally T.

About the Calla Cress Decrypter Series

The Calla Cress Decrypter Series is a female-led action-adventure techno-thriller series that blends global espionage, cryptography, and high-stakes discovery.

Often compared to a female James Bond crossed with Indiana Jones, the series follows Calla Cress, a brilliant cryptographer and museum curator whose expertise in ancient manuscripts and hidden systems draws her into international conspiracies. As intelligence agencies, criminal networks, and secret organisations collide, Calla is forced to navigate a world where knowledge is power — and decoding the truth can destabilise nations.

Each book stands alone while contributing to a larger arc of global intrigue, making the series perfect for readers who enjoy smart, fast-paced thrillers led by a woman who survives on intellect, courage, and moral clarity rather than brute force alone.

What Kind of Thriller Is This?

This book is best described as a female-led action-adventure techno-thriller.

It combines:

Technothriller elements (cryptography, data, hidden systems, modern intelligence warfare)
Espionage and conspiracy involving governments and shadow organisations
Action-adventure storytelling across global locations
A smart female protagonist whose intelligence drives the plot

If you enjoy thrillers where ideas are as dangerous as weapons — and where discovery triggers global consequences — this series is designed for you.

If You Love James Bond or Indiana Jones…

Readers often compare this series to James Bond and Indiana Jones, but with a modern, female-led twist.

Like James Bond, the story features global stakes, intelligence agencies, and dangerous conspiracies.
Like Indiana Jones, it revolves around ancient knowledge, hidden artefacts, and discoveries that reshape history.

What sets Calla Cress apart is that intelligence is the primary weapon. Codes replace gadgets. Pattern recognition replaces brute force. And the heroine’s strength lies in insight, scepticism, and resolve.

Story Tropes & Reader Appeal

This book features many of the tropes readers love in female-led action-adventure techno-thrillers, including:

Brilliant heroine under extreme pressure
Lost civilisation with world-changing secrets
Ancient myth weaponised through modern science
Global conspiracy involving biotech corporations
Personal stakes tied to family and past trauma

Book 7 specific:

Atlantis of the Sands / Iram mythology
Dead languages and blank-page ciphers
Bombings linked to ancient sites
Desert expeditions and collapsing ruins
A mentor’s kidnapping and a father’s hidden allegiance

Is This Book for You?

This book is ideal if you love:

Female-led techno-thrillers
Archaeological adventures with real stakes
Ancient myths reimagined through science
Global action and exotic locations
Smart heroines forced to question who they can trust

You’ll especially love this one if you’re drawn to lost-citylegends, secret societies, and thrillers where history itself becomes a weapon.

Do I Need to Read the Series in Order?

Each Calla Cress novel is written to stand alone, with its own central mystery and resolution.

However, reading the series in order allows you to follow Calla’s evolving relationships, growing influence, and the wider conspiracy arc that unfolds across the books. New readers can start here, while returning readers will uncover deeper connections.

The Calla Cress Decrypter Thriller Series In 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 Falcom Syndrome
Book 10: The Queen of Sheba
Book 11: The Calculus Warning
Book 12: The Cobra Paradox
Book 13: Room of Martyrs
Book 14: Eiger Mosaic
Book 15: Enemy of Wolves
Book 16: The Pharaoh's Mask
Book 17: The Eternity Hypothesis
Book 18: The Sculptor's Code
Book 19: The Solomon Agenda
Book 20: The Pheonix Cipher
Book 21: The Cairo Key
Book 22: Red Fox Agenda
Book 23: Phaistos Disc
Book 24: Scorpion Gold

About Rose Sandy

Rose Sandy is an independent author and publisher known for writing female-led action-adventure and techno-thriller fiction.

She is the creator of the Calla Cress Decrypter Series, a globe-spanning techno-thriller series often compared to a female James Bond crossed with Indiana Jones. Her work blends cryptography, global conspiracy, and high-stakes discovery, with a focus on intelligent heroines who survive through insight, courage, and moral clarity.

Rose Sandy’s stories are characterised by fast-paced plots, international settings, and the collision of history, technology, and power. Her fiction is written for readers who enjoy smart thrillers with real-world stakes and strong female protagonists at the centre of the action.