>> which is why just hours after the kids discovered debbie was missing it was 2:20 a.m. by then. police called dave, woke him up. asked him to drive down to police headquarters for a talk. the phone call was curious, thought investigator madison because dave didn't ask why. >> i've received calls in the middle of the night. my first thought for me is family. what's going on, especially if it is the police department. he didn't. >> and when he arrived in the interview room. >> what's going on? >> dave didn't seem to have much of a reaction at all to learning his ex-wife, the mother of his three kids, was missing. >> at this point i have no clue as to where she might be. >> i can tell you what has been going on the last week. >> what did you expect? >> more surprise. any surprise. >> mm-hmm. >> i didn't see that at all. >> of course, people do react in different ways to traumatic news. besides, dave told them he was