Hidden in the stone bones of a 15th-century Scottish chapel are carvings so strange, so impossible, that some believe they unlock secrets guarded since the fall of Jerusalem. Native American corn, centuries before Columbus. Musical cubes that may carry a forgotten melody. A sealed vault that could hold the Holy Grail.

This is Rosslyn Chapel. And it may have been built not to worship God… but to hide the final treasure of the Knights Templar...