Angelology by Danielle Trussoni
This book supposes that Genesis 6:5 is a record of how angels of heaven mated with human women and children were born. These children were Nephilim and they walk the earth still. God tried to cleanse the earth of the Nephilim during the Deluge. One of the Nephilim killed Noah's son Napheth and used magic to appear to be Napheth. After the flood, the sons of Noah spread across the land to repopulate. Napheth and his family went to Europe. All children of Napheth after this time were actually Nephilim. These children were more ruthless than the human children that had been born to the real Napheth. The Nephilim were more war-like and devious and had a tendency to be more financially and politically benefited in their lives.
Throughout time a group of humans called angelologist have been at war with the Nephilim. They spend their time scouring ancient texts for clues of the family lines of Nephilim. They are determined to stop at nothing until they can destroy all Nephilim on the planet and keep them from ruling over and manipulating the humans.
This books weaves Mythology, Legend and Biblical tales to create a thriller in modern day New York.
I found the basis interesting although it was really hard to get into the book at first. I didn't really like the ending although I understand Trussoni is probably going to write more books in this series so it did set up for another. If you want a thriller that is different from most, this is definitely it. This is historical fiction in that it recounts some pretty ancient scenarios of biblical scholars alleged to be angelologist in the book.