Sanctus by Simon Toyne

In Sanctus Simon Toyne takes us into Dan Brown country with a secretive religious order protec ting a secret in a hollowed out mountain in southern Turkey.   Supposedly the founding group from which the Roman Catholic Church has sprung their purpose is to guard "The Sacrement".   Exactly how a group that was founded several thousand years BC is related to the RC Church is never satisfactorily explained but as the Vatican has become the conspiracy novelists villain-of-choice since the KGB was re-branded I suppose we have to put up with it.
The story opens when a member of the inner circle of the order goes rogue and throws himself from the top of the mountain stronghold into the laps of a group of tourists in full view of the TV cameras.   The order are unable to prevent the Turkish Police from taking away the body but use their considerable influence to frustrate any enquiry.   Naturaly the Abbot, CEO of the order, has a squad of ex-soldiers on hand when he deems some of the rough stuff is necessary.   Unknown to the Order the dead monk has a sister in the USA who is a journalist and she is soon on her way to Turkey to claim her brothers body and find out why he died.   At the same time there is another group, headed by an ex monk who managed to leave the Order and stay hidden, who are also after the corpse in order to fulfill an ancient prophecy.   Yes, another one of those!
I hope that I am not sounding too dismissive of this book as, of it's kind, it is very well written and I enjoyed it bearing in mind the necessity of disbelief suspension.   I think that my problem is that over decades of reading my disbelief has been suspended so often that it is now in the region of the International Space Station.   Never mind,  one does get a wonderful view from up here.