Professor Smith has always been every students favourite teacher. But when Sam and Izzie return to school after the summer holidays, their fun, energetic science teacher is gone. Professor Smith is anxious and when he is kidnapped in front of them, they realise that he was right to be so scared. But what dark secret could their science teacher be hiding? And can Sam and Izzie uncover the truth before their own lives will be put in danger? Integrated dossiers: - Detectives in Fiction - Forensic Science