The ExFil Protocol: Zero Protocol Chronicles: Book 4

Some signals do not spread.
They sink.
One year after the collapse of the Red Choir, the world has learned to survive without its machines—but not without its memories.
Across fractured cities and silent mountains, something has begun to move again.
Not as sound.
Not as data.
But as absence.
When structures lean toward old wounds and silence starts to hum with impossible rhythm, former ZOC operative Marcus Lin follows a trail that no longer exists on any map—one traced through stillness, buried...