person who's just vanished off this earth. >> reporter: a week and a half after marie vanished, or drove away, or whatever she did, the detectives went calling on the flanders. who said they fully expected marie would return soon. this wasn't the first time she took spur of the moment trips, they said. >> never to the point where she had to be reported to law enforcement missing, though. she came back. >> reporter: although the flanders told the detectives they were quite worried about marie's state of mind. >> they noticed a downward spiral. >> reporter: that she was going into a depression or something? >> she might be going into a depression state, yes. >> reporter: thing was, said the pastor and his wife, marie could have wild mood swings, and they knew she had a diagnosed mood disorder. did they tell you that she was bipolar? >> yes, told me she was bipolar. she had been taking medication, and was off of her medication, probably because of her giving birth to the child. >> reporter: but there was