In January of 668 A.D., Fidelma of Cashel—sister to the
king of Muman, an advocate of the Brehon law courts and a
religieuse in the Celtic Church—is called to investigate
the brutal murder of Abbess Faife and the mysterious
disappearance of six young female religieuse accompanying
her on a short pilgrimage away from her abbey. When Sister
Fidelma and her husband, Brother Eadulf, arrive they find
that there has been another death under mysterious
circumstances, one of the senior scholars of the abbey has
been bludgeoned. These two seemingly unrelated deaths—and
the further mysteries of the trade ship lured to its doom
on the rocky western shore of Ireland and the rumored
figure of "The Master of Souls" wrecking havoc and raising
rebellion—combine to create one of the most perplexing
mysteries ever faced by the redoubtable Fidelma.