CipherLock Press

The Umbra Signal is a Cipherlock Sci-Fi™ thriller by David Williams that fuses Cold War mystery, speculative physics, and emotional codebreaking into a cinematic, mind-bending novel.
Fans of Arrival, Dark, and Silo—this one’s for you.
🛰️ What begins with a whisper becomes a global phenomenon.
📅 Available July 31, 2025
🌐 Pre-order now at www.umbrasignal.com or on Amazon [https://a.co/d/goCB0fe]