couriers or some other means of communication we haven't detected. or they just wasn't silent. >> can you cover it? can you fill those holes? >> if they don't communicate, no. >> that must keep you up at night. >> that's a concern. there's no question about it. coming up, finding the terrorists? it's like finding a needle in a hay stack. >> trying to find the pattern in the noise is the real trick. before paris, before isis, the u.s. had a different target. i wanna see, i wanna see. longing. serendipity. what are the... chances. and good tidings to all. hang onto your antlers. it's the event you don't want to miss. it's the season of audi sales event. get up to a $2,500 bonus for highly qualified lessees on select audi models.