Sanctuary combines modern-day intrigue with ancient secrets in a way that is becoming rather familiar these days, and in most respects the book succeeds. In particular, the ambiguities that surround some of the main characters (are they good guys? Bad guys? Somewhere in between?) are deftly handled. It is a thoroughly gripping read.
I have only two gripes. The first is that the very bad guys conform closely to stereotypes; they are almost pantomime villains and this is disappointing given Khoury's ability to create credible and reasonably complex characters. This is what loses the fifth star.
My other gripe is that there are too many of these ancient secret plots now in publication. Individually they are all rather fun, but it doesn't pay to read too much in this genre. But I cannot set this entirely at Mr Khoury's door, of course, and it doesn't affect my 4 star rating.