brook chandler -- >> yeah. >> has to change his name. and the woman tops change her name and the characters, the militants who also have to change. these characters are almost from the same family but different -- >> there are certain psychological similarities between, you know, people on either side of the terrorism divide. if you're working undercover. the ability to lie and assimilate a whole alternative identity and be fine with that and to bring it off is not given to most of us. i dare say there's probably not a single person in this audience who could do it. i know i certainly couldn't. you know, psychologically there are certain -- including an incredible commitment to an extremely inconvenient life because to go undercover is to give up a lot. and i have brook early on talking about the cost of that life, which he's painfully aware. i was talking to a guy who was undercover who never did tell me his last name because -- that was not for me to know, but, you know, he's saying, you know -- and i have brook say this, more or less,