It could have been a Norman Rockwell scene. Troy and Alana Pack, ages 10 and 7 were walking with their mom and two other neighborhood kids to a Baskin Robbins ice cream store near their home in the comfortable Northern California community of Danville. It was a warm Indian summer night in October 2003. The kids had been out playing all afternoon. They had enjoyed a family barbeque and looked forward to their favorite after-dinner treat.