Corner of Bourbon & Division

Does anyone know of good books and/or resources that would explain the technical aspects of the preservation and, more importantly, the restoration of art works? More specifically paintings, but I am not especially picky about the medium if it comes down to it.

I am trying to write a story and realized that my plot kind of hinges on my understanding the ins and outs of how to restore paintings, which I emphatically do not. In fact, this is so far out of my league I don't even know where to start. /o\

Halp? Anyone? Bueller?