give information. that's very typical trade craft for a spy. >> so we took the safest course and sent agents along with them who would watch them and make sure they didn't meet or pass any information on to people. and from what we could tell, they didn't pass any information. but the alaskan cruise, that was our opportunity, i knew, to go inside his house, covertly. we had to see what he had stored, who his contacts were, if he had any letters or correspondence with people in china. that was an important moment in the case. to get inside. this was our opportunity to go in and see what he had. ♪ is it a force of nature? or a sales event?