a boy cathy had never met. cindy used the phone to finalize surreptitious plans. she would go to the dairy queen and get a ride to a surprise birthday party planned for scott the next day, sunday. cathy would be the alibi. >> she had told mr. zarzycki that she was going to church with me the next morning. >> come the next morning, cindy told her kid brother she was going out for a while. >> i'm like, where? you know, we're supposed to be together. dad's not going to be happy with us. and then she was like, i'm going, just stay here, and then she started walking, and i followed her, and she was like, go home, go back, and that's when she really changed her voice and screamed at me to go back, i was about supposed to come there. >> you can't be the tag along kid brother? >> yep. >> the infatuated 13-year-old softball case in her cool white boots and jean purse pivoted and strolled to the dairy queen. and then, she vanished. coming up -- frantic hours,