cindy zarzycki became one of those "have you seen this child" faces on the back of store coupons. forever 13 years old. she'd walked off to dairy queen on a sunday morning in 1986 and was never seen again. >> she looked up to me. i let her down. >> why do you say that? >> because i wasn't there. >> cindy's older sister, connie, had been away from the house that weekend. her kid brother eddie was also tortured with guilt. >> i wish i'd been there and out. >> you wish you would have