Nine-year-old Debbie was playing in a school parking lot with her 11-year-old brother, Alan. A car pulled up to the curb next to the lot, and the man driving the car motioned for Debbie and Alan to come over. When the man asked where they lived, Debbie described their house. The man then asked Debbie to take him to the house, saying he would bring her right back to the lot afterward. Debbie got into the car with the man and they drove away. When they did not return after an hour, Alan went into the school and told a teacher what had happened. Debbie did not return home that evening. The next day the police received a report that a body had been found near an abandoned house on a dirt road in the county. It was Debbie, who had been stabbed to death with a knife.

• What steps should be taken immediately?
• Where would an investigator expect to find leads?
• What evidence would an investigator expect to find?
• Specifically, how should one investigate this murder?