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>> if tina was sitting here, don't we wish that she were. what would you tell are about all those years? >> i would tell her that i love her. and that we try the hardest. and that we are going to keep trying. justice is not wholly served yet. keep pushing. e. why would a father drop off his daughter and disappear? >>> i'm craig melvin, and this is dateline! >> he loved his daughter. his daughter was his life. >> it was a puzzle for police. why would a father drop off his daughter and disappear? >> i knew something was not right. >> then they found it. the diary that he recorded in secret. >> this whole thing is just getting absurd. >> and the clues came pouring out. blind, in the bushes. >> this was the hot spot? this was the crime scene? >> a stunner of a surveillance team. >> charles, rob. >> anything you might need for a murder! >> exactly. >> and what may just be. the most sinister mother daughter conversation that you have ever overheard. >> it's already in motion, you need to do your part. >> these are not the same people that the publ