PRE-ORDER TODAY!

(YOUR BOOK WILL BE DELIVERED TO YOUR EMAIL INBOX ON RELEASE DAY)

Some secrets beneath the Vatican were meant to stay buried...

When a Vatican archivist discovers a hidden chamber beneath St. Peter's Basilica known only as the "Room of Martyrs," he vanishes without a trace. Inside this forbidden vault lie ancient relics and coded diaries that contain a devastating secret: the martyrs didn't just die for their faith, their blood contains the power to control it.

British Museum curator and covert operative Calla Cress is summoned to Rome, where what begins as a scholarly investigation quickly becomes a desperate race against time. The diaries reveal a dark prophecy: if the martyrs' relics are ever reassembled under one symbol, they could trigger mass religious devotion bordering on mind control.

As Calla deciphers the ancient cryptograms, she experiences vivid visions connecting her to the martyrs' final moments, a genetic ability that makes her both uniquely qualified to understand the threat and dangerously vulnerable to its influence.

Cardinal Severus, a Vatican official with a hidden agenda, is already gathering the scattered relics. Behind him stands the enigmatic Mason Laskfell, a technological genius who plans to amplify the symbol's psychological effects to create the most powerful mind control weapon in history, starting with world religious leaders gathered at an upcoming summit.

When Calla discovers the final component hidden in the British Museum's collection—protected by her own family for generations, the case becomes devastatingly personal. The coded diaries suggest her miscarriage wasn't natural but a calculated intervention to prevent a child genetically resistant to the symbol's power.

With her partner Nash Shields, an elite NSA tactical operative with his own connection to the case, Calla must navigate Vatican politics, ancient rituals, and cutting-edge technology to prevent a global catastrophe. From Rome's ancient catacombs to London's historic churches, from forbidden Vatican archives to a high-tech summit where minds will be controlled and faith weaponized, Calla races to stop those who would transform humanity's greatest strength, belief itself, into its greatest vulnerability.

In her most dangerous mission yet, Calla Cress confronts the thin line between faith and manipulation, devotion and control—while facing an enemy who understands that the most powerful weapon ever created isn't forged from steel or science, but from the very blood of believers.

ROOM OF MARTYRS is the electrifying installment in the internationally bestselling Calla Cress series, perfect for fans of Dan Brown, James Rollins, and Steve Berry.

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.

Tropes You'll Love:

Listen to the series here: