Silent Witness: The Lost Child (Part 1 of 2)

When the half-naked body of a 12 year old boy is discovered in a ditch near his school, the team is called in, bringing Nikki into contact with one of her former teachers, now the headmaster. When signs of abuse are found on the boy's body, and one of his friends disappears, the team fears the worst. Under increasing pressure from the police, they must find clues from the dead in order to save the living.