St. Patrick's Gargoyle by Katherine Kurtz is currently $1.99 from Open Road.
This is not part of her Deryni series and the style is somewhat different, I still enjoyed it as a light quick read but suggest sampling first to see if you like the difference.
https://www.kobo.com/us/en/ebook/st-...k-s-gargoyle-2
https://www.amazon.com/gp/product/B01FRQEV9C
The gargoyles of Dublin, Ireland, have a sacred duty to perform. Formerly God’s avenging angels, for centuries they have been entrusted with guarding the churches and cathedrals of the Irish capital while avoiding all contact with human beings. But once a month these loyal stone sentries must leave their posts to attend a conclave of their kind, and it is during one such absence that a sacrilege occurs.
The guardian of St. Patrick’s Cathedral, the gargoyle Padraig, called “Paddy,” has returned to find violence and vandalism committed at his church and two silver artifacts stolen. Taking to Dublin’s night streets in search of a culprit, Paddy inadvertently reveals himself to an aged chauffeur in an ancient Rolls Royce, thereby dooming Francis Templeton to an impending premature death. But the grim reaper will have to wait, because old man Templeton is a member of the Knights of Malta, a secret order of defenders of the faith dating back to the Crusades, and as such is an ideal partner for the onetime angel in his quest for justice and revenge. Their hunt is about to take some sinister turns, however, leading the gargoyle and the knight to Clontarf Castle, where a major demon, an emissary of Satan, is preparing to make his reentrance into the world.