Penance of the damned
(Book)

"Ireland, AD 671. King Colgú of Cashel is shocked to learn that his loyal Chief Bishop and adviser has been murdered in the old enemy fortress of the Uí Fidgente. When word reaches Cashel that the culprit will be executed under new law, a larger conflict threatens. Dispatched to investigate, Sister Fidelma and her companion Eadulf discover that the man facing punishment is Gormán--commander of the King's bodyguard. Fidelma cannot believe Gormán would carry out such an act--and yet he was found locked in a chamber with the body, weapon in hand. The evidence stacks up against him. If they are to save Gormán and keep the peace between the kingdoms, Fidelma and Eadulf must find the true culprit. As the threat of war looms, the date of execution draws ever closer...." -- From dust jacket.