The Fraternity of the Stone

This novel follows Drew MacLane, a former member of a clandestine government-sanctioned organization called Scalpel, who has retreated to a monastery to do penance for his past sins.

However, his peaceful life is disrupted when his monastery is attacked, and he must navigate a complex web of espionage, religious conspiracies, and historical secrets to survive.

The story is part of the 'Brotherhood of the Rose' series but can be read as a standalone novel.

It introduces elements of religious and historical conspiracies into the spy thriller genre, influencing later authors like Dan Brown and Steve Berry.