ID this book, "Dumbarton Oaks"

There was a book I read about 8 years ago, no idea if it was new then or not, that involved a group of students, I think, and took place in or started in Dumbarton Oaks, in Wash. DC.

The details are extremely fuzzy, but I think it was a group of college students and had a esoteric plot, somewhat like Foucalt’s Pendulum with a mix of secret societies involved, ie Templars, Rosicrucians, etc…

Any help in ID’ing this book would be greatly appreciated.

Anyone?

Did you look over the Dumbarton Oaks Gardens site? They have a publications link but my eyes glazed over when I tried to scan through it.

I did actually, but the book wasn’t really about D. Oaks, but I think started there or had people studying near there in the plot, it was just the only thing I could think of as a distinguishing characteristic.

At least 3 main characters in the main group. One leader, a girl and a secondary guy who was the main narrator.

Bah, it was a very minor piece of sci-fi / fantasy I’ve been trying to locate.