Rosslyn Chapel is one of the most evocative enigmas of all time. It is a stunning, mysterious and beautiful 15th-century Gothic masterpiece, situated near Edinburgh. In fact, nothing at Rosslyn is what it seems. Its hidden signs led the authors to a lost holy relic - the skull of St Matthew, to whom the chapel is dedicated. They discovered startling evidence that this skull was brought to Rosslyn by Sir Gilbert Hay, architect of the chapel. What follows is no less than an adventure, as the authors use clues from the lost books of Hay s library to locate St Matthew's skull. What they discovered about Rosslyn Chapel would have had its builders burned at the stake if their true motivations had been discovered.