It's a blog! Mainly of book reviews.
This is a 1976 entry in the fanatical/psychotic Christian sect - world shattering Religious Artefact supressed for centuries sub-genre of the thriller. It's a good deal more competent than a more recent such book that also features a trip to the Louvre, but then so are my schoolboy fictions.
It deviates somewhat from the standard Ludlum formula, being one of the few with a historical setting and straggling through three generations of protagonists. This latter is a bit disconcerting but this volume is still a swift read, full of incident. Neither in the top nor bottom rank of Ludlum's many works.