The Echo Protocol

By M. M. Crusinberry

The system is gone.

The world is free.

Harper is alive.

But the silence isn't peace.

A message appears with no sender.
A voice whispers in her mind.
The enemy she destroyed is still inside her.

Now Harper must fight a war no one else can see -
before the system returns and the world becomes a prison again.

A standalone sci-fi thriller with a killer twist and a high-stakes finale.

• Format: Paperback
• Language: English
• ISBN: B0GHM2NDVM
• ISBN13: 9798244482447
• Release Date: January 2026
• Publisher: Independently Published
• Length: 456 Pages
• Weight: 1.33 lbs.
• Dimensions: 1.0" x 6.0" x 9.0"