The Vault of Bones is a follow up to 'Relics', which I unfortunately haven't read, and is about our lead character Petroc who is an ex-monk. The story involves the hunting of religious relics, from around Europe, which involves; Dignitaries like the Pope, various murders and mysterious priests.
In genre terms I guess this would be labelled as an historical thriller, however in my opinion the pacing is way too slow to be a real 'thriller' and as such it never maintained any excitement with me. I was never really gripped and I, as with the pace of the book, meandered my way through at times long sections of...nothing.
That been said, it wasn't a book that contained absolutely no interest to me. The bits of action, when they do occur, are reasonable and the insight into the time period is good. But my interest to pick up the first or last instalment is low and unlikely.