how the trail was put together, how they developed the information on the courier, piece by piece, pebble by pebble as former cia director mike hadden said, it took years. >> 2005 when they were building this mcmansion over there, their equivalent of chappaqua, building their equivalent of this guy, do you think if we had had him in his crosshairs, wouldn't we have noticed it? do you think they could have built that mcmansion and their equivalent of chappaqua, don't you think we would have noticed he was there? >> what we have been told is that we didn't really find this mcmansion, if that's what you want to call it, the compound until august of last year. so and the story of how we found it by following the couriers is a fascinating intelligence detective story u i'm just not sure it links to particular