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The Decrypter: The Pythagoras Clause - Book 5 (EBOOK)
The Decrypter: The Pythagoras Clause - Book 5 (EBOOK)
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Predicting the future was supposed to be a game – until it turned deadly.
When a seemingly harmless horoscope app begins correctly predicting events and leaves its users in deep comas, codebreaker Calla Cress is thrown back into the world of spies and secrets. The app issues a chilling warning about her own fate and triggers an old nemesis to resurrect a lost technology built by a student of Pythagoras. With the help of her team, she must decode the mathematical clause embedded in the app’s code, revisit painful memories and race across continents, before the algorithm makes one final prediction that will erase free will.
You download the app. It predicts your future. Then you never wake up.
British Museum curator turned secret agent Calla Cress didn’t want to know the future. Heck, the future can wait, but not when it’s wiped clean her present.
The Decrypter and The Pythagoras Clause pits museum curator and secret agent Calla Cress against her most personal and mind‑bending adversary yet. When a horoscope app starts predicting real events and sending its users into comas, Calla’s own life is threatened by a prophecy she can’t ignore. To stop the crisis, she must unravel a Pythagorean algorithm embedded in the app—one that has roots in ancient Greece and ties to her own genetic engineering.
From the bazaars of Istanbul to the old streets of Havana, she decrypts centuries‑old ciphers while evading a ruthless tech magnate bent on mastering destiny. This heart‑pounding techno‑thriller blends cryptography, artificial intelligence and historical intrigue into a story about the cost of knowing the future. With vivid settings, relentless action and ethical quandaries, it delivers the perfect blend of high‑octane suspense and thought‑provoking speculation.
Get ready for a wild ride of non-stop action and suspense with this thriller, perfect for fans of Steve Berry, Scott Mariani, Ernest Dempsey, and Clive Cussler.
Reader Praise
“Predicting the future was supposed to be a game, until it became deadly serious. This thriller will have you flipping pages into the night.”
“An exhilarating cyber‑thriller packed with history, codes and action from Turkey to Havana. Fans of Dan Brown, Scott Mariani and Clive Cussler will love it”
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
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:
predictive horoscope app, technothriller novel, AI prophecy thriller, Calla Cress codebreaker, cyber espionage book, science fiction suspense, ancient mathematics mystery, global conspiracy thriller, female spy hero, data privacy novel, Black Mirror fans, techno suspense, Rose Sandy new release, international action adventure, mind control app, secret society thriller
Locations & interesting places in the book
- Masai Mara, Kenya: A wildlife reserve where Calla and Jack climb a disguised transmitter mast to stop a biohack.
- Hannam‑Dong UN Village, Seoul: Home of Chun‑Hei Tam; illustrates the everyday impact of the Scope app.
- Istanbul, Turkey: Historic mosques and markets hide clues to the Pythagoras Clause; the city’s blend of East and West adds atmosphere to the hunt.
- Havana, Cuba: Colonial architecture and revolutionary forts hold carvings of the Clause; the sultry climate contrasts with the precision of mathematics.
- UK Space Agency Research Center, Swindon: Site of the prologue where Nicole meets Andor Heskin and sets events in motion.
- Caribbean research facility: A secret island lab where comatose victims are connected to servers running the Clause algorithm; the climactic showdown occurs here.
- London: Calla’s base of operations at the British Museum; serves as a hub for research and planning.
| Pages | 376 |
|---|---|
| Paperback ISBN |
978‑1‑393‑85182‑0 |
| Paperback Dimensions | 5 x 0.51 x 8 inches |
| Language | English |
| Categories |
Technothriller, Science Fiction, Cyberpunk, Action Adventure, Thriller, Spy Fiction, Conspiracy Thriller, Predictive AI, Ancient Mystery, Women’s Adventure, Data Privacy |
| Series | The Calla Cress Decrypter Thriller Series, Book 2 |
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Where imagination knows no bounds and adventure awaits at every turn.
Another hit for Rose Sandy, the 5th book in the series and probably the best yet, keep it up Rose I highly recommend this book.
A well researched and written book. Rose has "Been and seen". As someone who has also visited and seen many of the places vividly described, I can also say "Thanks for the memories" : I have had knives and guns pulled on me and walked past unexploded devices et cetera so I can relate to the excellent descriptive writing and hope that there will be many more books to come. Enjoy.
Another excellent Calla Cress adventure, gripping excitement to the end. Great read, would recommend it to anyone.
As we have come to expect from this author this is a well written fast-paced blockbuster of a book, brilliant storyline amazing characters with twists and turns to keep you turning pages till the wee small hours. I can't recommend this book highly enough an outstanding story, can't wait for the next one, Baz.
The thriller series that keeps on giving. Once again the story keeps you gripped from start to finish. Read as apart of a series but could be read as a stand alone book although some of the background info would be missing then. Like that there is lots to think about not just in the story line but the thought patterns from the wealth of information given