Highlining: Slacklining 2.0? Extreme sport takes hold "48 Hours Mystery" preview: Ransom note mystery "48 Hours Mystery" correspondent Peter van Sant joins the "CBS This Morning" co-hosts with a preview of the story of a young man who vanished in 2008. Two days later, his father opened an e-mail demanding $750,000, and a nightmare began. A convicted suspect insists to this day he's not guilty.