1 11

Silver Gravity Books

£30.00 GBP

Sale Sold out

Taxes included.

Format Hardback Ebook Paperback Audio

The Decrypter: The Eternity Hypothesis: Rose Sandy, Calla Cress Decrypter Thriller Series, Book 17

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

Every Silver Gravity story centres women with agency.

FREE instant Ebook version with every hardback, paperback or audio sale!

EBOOKS ARE DELIVERED INSTANTLY. YOUR DOWNLOAD LINK ARRIVES BY EMAIL RIGHT AFTER CHECKOUT. PAPERBACKS/HARDBACKS ARE PRINTED TO ORDER AND TYPICALLY SHIP IN 3–7 DAYS.

Digital immortality is possible. She knows why it's forbidden.

When brilliant cryptographer and ISTF agent Calla Cress identifies an ancient pattern hidden in Tibetan manuscripts, she unwittingly becomes the key to unlocking humanity's most dangerous discovery: digital immortality.

A secretive scientific coalition led by billionaire tech visionary Tashi Montaigne claims to have perfected the "Eternity Hypothesis" – a revolutionary formula merging quantum computing with ancient consciousness transfer rituals. As the world's elite scramble to control this technology, Calla recognizes something the scientists missed – these aren't just mathematical formulas, but warnings.

From the windswept monasteries of Tibet to the shadowy tombs of Egypt and the mysterious monoliths of Easter Island, Calla and her team, including operative husband Nash Shields and tech genius Jack Kleve, race to decode a global network of consciousness that has been protected by guardians for millennia.

But they aren't alone in this pursuit. Mason Laskfell, a figure Calla believed defeated, manipulates events from the digital shadows, seeking not just immortality but dominion over whose consciousness survives—and whose doesn't.

As quantum disturbances threaten the very fabric of human consciousness worldwide, Calla must confront the ultimate question: Was death designed as our enemy, or our protector?

In this high-stakes international thriller spanning ancient wisdom and bleeding-edge technology, New York Times bestselling author [Author Name] delivers a pulse-pounding adventure that will change how you think about life, death, and what might lie beyond. For fans of James Rollins, Matthew Reilly, and Daniel Silva who crave thought-provoking action that pushes the boundaries of reality.

Immortality was never the gift they promised. It was the trap.

Listen to the series here:

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

Is This Book for You?

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.