Britain's churches are one of our greatest national treasures. But at a time when two churches a week are closing, everywhere they are under threat. This series follows those fighting to preserve Britain's unique heritage.
The story of Rosslyn Chapel near Edinburgh, which has long been the focus of legends connected with the Holy Grail. The extraordinary building was catapulted into the limelight through the success of Dan Brown's best-selling book The Da Vinci Code after quietly decaying for decades.