I'm having trouble finding books related-enough to what I'm looking for, and I'm hoping someone here can shove me in the right direction. I'm looking for good reads which are generally modern-day, dealing with conspiracy issues and preferably in a thriller format.

Examples that turned me on to this genre, some of which I read a long time ago as a child who was only allowed to read Christian novels by his parents:

• A Skeleton in God's Closet
• DaVinci Code
• The Cooper Kids Aventures by Frank Peretti
• Foucault's Pendulum

Note that I'm very aware that most of these were horribly-written, but something about the genre sucks me in.

Extra points for books that deal with occult or supernatural issues, but that's not a requirement - anything mundane with historical origins (knights templar, etc) is just as appealing. I'm an atheist as an adult, but I'll take any suggestions including ones with religious didacticism such as the aforementioned books.