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In January of 668 A.D., Fidelma of Cashel - sister to the king of Muman, advocate of the Brehon law courts and religieuse in the Celtic Church - is called to investigate the brutal murder of Abbess Faife and the mysterious disappearance of six young female religieuse while away on a short pilgrimage away from their abbey. But when Fidelma and her husband, Eadulf, arrive, they are confronted with another violent murder under mysterious circumstances.

A woman awakes in the morning to find that someone has picked her apartment’s supposedly impregnable door lock and rearranged personal items, even sitting beside her while she slept. The intrusion, the police learn, is a message to the entire city of carnage to come. Lincoln Rhyme and Amelia Sachs are brought in to investigate and soon learn that the sociopathic intruder, who calls himself "the Locksmith”, can break through any lock or security system ever devised.

To save the lives of her friends, Rachel did the unthinkable: she willingly trafficked in forbidden demon magic. And now her sins are coming home to haunt her. As Rachel searches for the truth behind a terrifying murder, an even greater menace threatens, for the demon Algaliarept will stop at nothing to claim her, and the discovery of a shocking family secret throws Rachel's entire life into question.