The Wall is too long to belong to one story.
Empires claim it. Officials explain it. Travelers distort it. Cranks inherit it. Everyone has an answer for what it means.
The boy, Vale, and the Builder come looking for something harder than meaning.
They come looking for function.
As they follow old stone across mountains and weather, the trio begins to uncover signs that the Wall was never only a defense monument. Its intervals are wrong. Its rebuild phases conflict. Its record has been laundered by too many generations of custody mistaken for authorship.
The more they learn, the more dangerous the truth becomes.
Because if the Wall is really an instrument, then history has not merely forgotten what it was for.
History has been using the wrong story on purpose.
Now the trio must decide what to do with a record powerful enough to embarrass dynasties, feed conspiracies, and wake older questions than any empire wants asked.
Some structures divide nations.
Some measure them.