The Umbra Signal

By: Williams, David

When a mysterious signal from a distant galaxy reaches a hidden SETI outpost, former Air Force intelligence officer Liam Mills finds himself pulled into a labyrinth of ancient codes, Cold War secrets, and a force capable of bending time itself.

Together with codebreaker Gina Alvarez, historian Ben Levinson, and maverick engineer Marcus "Sparky" Adler, Liam must uncover the truth buried across decades of hidden transmissions. What begins as a midnight decoding session spirals into a battle against an intelligence that has shaped human history from the shadows.

Blending cutting-edge science with heart-pounding suspense, The Umbra Signal launches the Cipherlock(TM) Sci-Fi Series - a story of signals, memory, and survival at the edge of time.

• Format: Paperback
• Language: English
• ISBN: B0GNF3B47S
• ISBN13: 9798994684405
• Release Date: July 2025
• Publisher: Cipherlock Press
• Length: 530 Pages
• Weight: 1.54 lbs.
• Dimensions: 1.1" x 6.0" x 9.0"