In February of 668 A.D., Fidelma of Cashel and her companion Eadulf are about to get married. Again. Their initial trial marriage of a year and a day has ended and they are about to embark on a permanent partnership. As the sister to the King of Muman, Fidelma's marriage ceremony is a major event in the kingdom of Ireland and the High King, as well as kings of the other Irish kingdoms and other major figures are going to be in attendance. One not so welcome guest is the fanatical Abbot Ultan, who advocates the radical position of celebacy for all religieuse and feels that Sister Fidelma's upcoming nuptials are an abomination. On the eve of the ceremony, Abbot Ultan is found murdered in his chamber. Worse still, one of the most distinguished guests, the King of Connacht, has been seen fleeing from the scene and is charged with the murder. Quickly Fidelma, who is appointed in the King's defense, discovers that Abbot Ultan is not the pious man he was thought to be, and has numerous enemies amongst those assembled for the wedding. Her wedding delayed, the high born guests restless and querulous, and the murder and it's aftermath threatening to cause chaos throughout the Kingdom, it's up to Fidelma to uncover the murderer—and the truth behind the murder itself—if the often tenuouos peace of 7th century Ireland is to be maintained.