[ male announcer ] it's one thing to talk quality. it's another thing to back it up. the chevy 5-year/100,000 mile transferable powertrain warranty. with roadside assistance and courtesy transportation, it's the best coverage in america. it's the ultimate cold case, more than 30 years after the disappearance of five teenagers made headlines, police say they finally have a break. cnn's mary snow is monitoring this story.