Book excerpt: Nestling in an exquisite glen just seven miles from the centre of Edinburgh, Rosslyn Chapel is one of the world's most extraordinary places. Ever since it was built in the mid fifteenth century it has cast a mesmerising spell over all who have visited it, exuding an aura of profound mystery, as if it holds the key to some vast, unearthly secret. Six hundred years later it continues to confound and intrigue, inspiring stories of The Knights Templar, the Holy Grail and a myriad of esoteric beliefs, most notably in the 1980s bestseller The Holy Blood and the Holy Grail and Dan Brown's The Da Vinci Code, which made the chapel known to millions throughout the word. In this book Roddy Martine sifts through mounds of unfounded conjecture and fantasy to make sense of it all. The Secrets of Rosslyn is the only book that lets the facts speak for themselves, showing ultimately that the truth is no less amazing than fiction.