Under this city there is granite, and in winter it feels like the whole of Concord is cut from it — the quarry ledges up on Rattlesnake Hill, the curbstones along the streets, the frozen dooryards that ring underfoot. Bult Property Services works the hours nobody else wants, the three-in-the-morning hours when plow lights are the only color moving on the Heights. Snow gets pushed back to the true edge of a driveway, not just far enough to squeeze a car through, and the walk to the door is opened wide. By the time the kitchen lights come on, the storm is already something that happened yesterday. That is the whole point: a household that steps out into a clear morning and never has to think about the work at all.