A tale of many discoveries

During potions class, a 15-year-old Hermione stands up to Snape, who is tearing Neville to pieces. As a result, the professor makes her serve detention with him, which causes Hermione to become witness to an alarming conversation between Dumbledore and Snape. Being in detention, week after week, Hermione makes a lot of observations, some most unexpected, some most unwelcome.