In the 15th and 16th centuries, the Scottish border was as lawless as the American Wild West, with raiders known as reivers robbing, pillaging and murdering with surprising frequency. At the same time, their feats were celebrated in a series of romantic ballads. This Saturday, three teams of history hunters investigate some of those ballads to find out the truth behind them by perusing ancient documents, examining maps and trekking through the undergrowth to uncover the meagre remains of this exciting period of Anglo-Scottish history.