Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
Librería Perelló (Valencia)
Librería Elías (Asturias)
Donde los libros
Librería Kolima (Madrid)
Librería Proteo (Málaga)
Some signals aren’t heard. They’re remembered.When reclusive mathematician Robert Luden is found dead, his final legacy is a spiral-covered notebook and a niece convinced he was silenced. Enter Silas Quinn and Marla Dean-spy-vestigators who specialize in cases too strange for anyone else to touch.What begins as a murder mystery quickly unravels into something far more insidious: a hidden signal embedded in architecture, memory, and thought itself. Luden’s research into harmonics and cognition wasn’t just theory-it was a doorway. And someone, or something, is watching on the other side.As competing shadow factions race to control the cipher, Silas and Marla find themselves spiraling into paranoia, altered perception, and a terrifying realization: the message isn’t just out there-it’s already inside.From the author of Frozen Lies and The Ashes in Room 302, The Spiral That Watches is a chilling, cerebral thriller that explores how we process the world-and what happens when someone else rewrites that code.