Black Grotto takes place in Scotland and begins in the year AD 500 when a great Druid prophet named Erin travels with his scribe to a primordial and sacred cave high up in the Three Sisters. At the age of eighty, he is guided there by his dreams in order to finally reach the zenith of his prophecies. The story then moves forward in time to AD 2022 where a young Druid named Bea Bauman is coming of age. It is a very special day and one where her mother and father finally share with her the true story of her birth. What she learns that day completely changes her life, and she sets out alone on a long journey across the width and breadth of Scotland. Her wanderings are filled with danger, magic, and overpowering discoveries. They take her to ancient Druid places of power, places of raw and natural beauty, of history and lore, and introduce her to Anu Grenn and Willam Brodie - her unexpected mentors. But as all of this is happening, a Druid priestess named Brenna is secretly observing Bea. She is biding her time and preparing to connect with the earth’s darkest magic at just the right moment in order to bring the world to its knees. She pursues Bea and her own destiny without mercy as these two “black-haired beauties” edge the world ever closer to the precipice of a very dark and treacherous abyss - a place where the forces of light and darkness hang in the balance.