In the year 666, Sister Fidelma goes to a remote valley whose inhabitants still adhere to ancient Druidic ways. As they approach the valley, Fidelma and her companion come across the bodies of 33 young men ritually killed and laid out in a Druidic pattern. Are these murders the work of the local pagans or something more sinister?

Sister Fidelma-an Eognacht princess and sister to the king of Cashel, a religieuse of the Celtic Church and an advocate of the Brehornn court-is one of the most interesting and compelling figures in contemporary mystery fiction. In this collection of short mysteries, Tremayne fills in many of the background details of Fidelma and seventh-century Ireland not found in the novels, and weaves his always-beguiling mix of history and mystery.