Re: Fringe 4x19 - "Letters of Transit" (Live Commentary, Spoilers)
There was such a dangling thread on this episode... seems odd for it to be a stand-alone.
I'm thinking this is the plot thread that Lance Reddick mentioned as being the potential storyline for Season 5, if the show gets renewed.
"We travel the world in search of what we need, and return home to find it." - George Moore