In this book Ian Crofton makes a journey on foot from Gretna Green in the southwest to Berwick in the northeast, following as close as possible the Anglo-Scottish Border as it has been fixed since the union of the crowns in 1603. Much of the line of the Border runs through a wild, overwhelmingly unvisited no man's land - the sort of trackless waste perfect for keeping two belligerent peoples apart? During the course of his journey Ian Crofton considers a number of questions how 'natural' are borderlines? Sometimes they follow physical barriers, sometimes an arbitrary line on a map, the compromise made by some committee of distant diplomats.