trouble. worse, an accident. whoa. reporter: frank worked with his father and sister s husband at a manufacturing business in central florida near tampa. they made the kind of conveyer systems you see in dry cleaners that retrieve garments. but now, on the twins birthday, it was getting late. the last time they talked, frank told maria that his sister, diane, would be picking up him and her husband, george patisso. they d all arrive together. but where were they? when did you know something was wrong, something terrible? i think when my mom started getting nervous. so 6:00, no frank, you re starting to wonder? i had a lump in my throat. i was a nervous wreck. what were you worried about? because it was unusual for frank to be 45 minutes late and not tell me that he was going to be late. reporter: maria dosso called her husband s parents, phil and nicoletta. they hadn t heard from their son or daughter either. so the elderly dossos got in their car about 6:30 p.m. and d