STOP DOESN'T MEAN FINISHED.
Nadia Fletcher has come back to a mountain highway tunnel for its final safety checks. Then a storm cuts off the roads, leaving seven people inside with machinery that no longer obeys its controls.
A stopped gate begins to move. Failures that should be random follow a pattern. And every repair gives something else a way to continue.
The crew knows the equipment. They know the procedures. But the readings can't be trusted, and the safest response to one danger may set another in motion. To find a way out, Nadia has to work out what the tunnel has begun-and which operations they can afford to finish.
They can stop a machine.
They still have to live with what they started.