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Silver Gravity Books

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The Decrypter: The Enemy of Wolves: Rose Sandy, Calla Cress Decrypter Thriller Series, Book 15

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

Every Silver Gravity story centres women with agency.

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Ancient runes. Modern technology. A deadly countdown begins.

When digital wolves appear in augmented reality apps worldwide, infrastructure crumbles in their wake. As global cities plunge into chaos, operative Calla Cress recognizes something impossible embedded in the attack—ancient Nordic runes controlling modern networks.

For the radical eco-terrorist group calling themselves "the Wolves," technology has become a weapon against itself. Their charismatic leader, Freya Storme, believes she's found the path to restoring natural balance by cleansing the world of technological civilization. But unknown to her followers, a darker mind manipulates their cause from behind prison walls.

As Calla tracks the escalating attacks, the runes begin whispering to her, revealing a connection to her family's secret past as guardians of a power sealed away centuries ago. When Freya delivers a chilling message—"Your unborn child carries the mark of the wolves"—the mission becomes devastatingly personal. Her miscarried child's cells continue dividing, existing between worlds, making it the ultimate target in a conflict spanning millennia.

With global systems failing and time running out, Calla must assemble an unlikely alliance: her tactical partner and lover Nash Shields, tech innovator Jack Kleve, and even the enigmatic Freya herself, who realizes too late the catastrophic consequences of what she's unleashed.

As Arctic ice melts to reveal an ancient facility where technology and nature have impossibly merged, Calla faces the ultimate choice—repeat her ancestors' sacrifice to suppress this power, or attempt something unprecedented that could transform humanity's relationship with both technology and the natural world.

But failure means more than global collapse. It means losing the fragile new life growing within her that connects all worlds—past and future, digital and natural, human and something more.

Perfect for fans of James Rollins, Matthew Reilly, and Dan Brown, ENEMY OF WOLVES delivers heart-stopping action across stunning global locations while exploring the delicate balance between technological progress and environmental harmony.

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.