>> he sat there for a bit, looked around. the russian notes in kate's handwriting made sense, but why chinese paper money? and why was her brand-new prescription sitting there untouched? >> the medication in which she had gotten for a prescription was still on her dresser, unused. >> that medication was her lifeline. she needed it to counter depression, anxiety, insomnia. she never left home without it. meanwhile, cyber-sleuth bill capps buried himself in social media sites. kate used them. bill scoured them all. >> if she was awake, she was facebooking, she was texting, she was calling people on the phone, she was e-mailing. and at the time she went missing, when everything immediately ceased, i mean, that was completely out of character for her. >> using kate's friends, capps built an electronic map of her communications the friday night she vanished. from kate's friend jason locke,