Two cleaning men found a woman stabbed to death in a school closet. She was a teacher at the local school, just moved in the last semester, so she still didn't have bond with her colleagues, apart from a man she dated a couple of times. She was in charge of the drama school, attended by a smart sixteen years old girl (Stephi Lineburg) who had many things to hide: at first she told to need tutoring when she had straight- As, then she said to have a sister when she's an only child, then to have a boyfriend she didn't have and so on. CCTV placed in the hall helped detectives realizing they were together the night of the murder. Actually she had an affair with the teacher who hung out with the victim, so the motive could have been jealously for her or fear of being convicted as child molester for him. But nothing so far from the truth, the teenager is a real con artist...
I can't believe a thing like this could happen in the real life; it's hard for anyone to look a decade younger than your actual age. McCoy seems confused at first, cutting a deal much to his assistant disapproval, but later on he is back in time to his old self.