In this study, Andy Goldsworthy traces the route along which sheep were once driven from Scotland over the border to markets in the north of England. A red sandstone arch, made of blocks hewn from a Scottish quarry, begins its journey in a dilapidated stone sheepfold deep in the hills of south-west Scotland. From there it progresses south, constructed early in the morning and dismantled in the evening in a rich variety of locations: on the site of a vanished stone sheep pen in a town centre, on land high above a six-lane motorway, and half-in and half-out of a stream running through lush pastureland.