ARC review of "Of Mercy & Of Death (The Seven Keys of Hildegard Book 1)" by David Depuis

A bit like Dan Brown but then with the Catholic church as the heroes. 

A set of devil worshippers tries to get a hold on the Seven Keys of Hildegard and the popes and the secret Brethren do all to prevent that. Are the keys just documents or are they meant to be key figures?

I liked the papal history and the story was well written but I HATE sudden open endings and the need to buy the next novel.

Because if the serialised concept 3 stars out of 5.