While investigating the savage murder of a religious magnate, Sister Fidelma uncovers a dark world of slavery and abuse within the abbey walls, in Peter Tremayne's thrilling new mystery. It is AD 670, and Bishop Leodegar has called the church leaders together for an emergency meeting. But a fierce row breaks out and the assembly descends into chaos. Later that evening one of the delegates is discovered murdered, his skull brutally smashed. Sister Fidelma and her companion, Brother Eadulf, unwittingly find themselves in the middle of a shocking murder investigation involving the most powerful religious leaders in the land. The disappearance of women and children and rumours of a slave trade indicate malevolent forces at work. To catch those responsible, Fidelma and Eadulf must challenge these fearsome individuals and in doing so, risk their own lives...