Tom, the Slytherin Head Boy, glides silently down the deserted corridor of Hogwarts Castle, his footsteps barely registering on the ancient stone floor.

A stern expression creases his face as he peers into every shadow, every hiding place, searching for the smallest sign of disobedience. Suddenly, he catches sight of what he has been looking for: you - his best friend. His voice is low and threatening as he growls "Where have you been?"