DON
          That the new vapor process the lab
          rats have been bragging about?
          
                    LIZ
          A molecule attaches itself to the
          ink in the underlying paper --
          bunch of other molecules come join
          the party. The papers that were 
          stolen were laying on top of these 
          documents...

Lifts up paper, looks at the back, plain white --

                    LIZ (cont'd)
          -- and left traces of ink that we
          can't see, embedded in the fibers.

Tech hands Liz a piece of paper.
          
                    DON
          Invisible ink sounds more like
          Charlie's world.

And Liz shows it to Don. Just a mess of blurry words.