There it was. Evidence she left for you to find . Yes a possible clue. Hidden, in an envelope marked baby pictures. But tucked inside . A journal that painted a different picture, entirely. We pulled out the envelope and that was like, wow. Could their mom help them solve her own mystery . We cant quit. We are her voice. We made a promise. We made a promise to our mom. Im lester holt. And this is dateline. Tonight, Keith Morrison with the promise. Reporter here they were again. Two sisters on a holiday in paradise. Or so the other vacationers must have assumed here in americas midpacific garden. In the lush resort near honolulu. But they would be wrong. This journey has more to do with a personal hell than any paradise. That and a long ago promise to their mother. Could you have believed that you would be sitting here in this hotel room, talking about this subject, in the year 2014 . No. Its pretty crazy. I could have never seen this coming. Reporter perhaps it is, pretty crazy. But th