Hermione Granger is crucial to Harry and Ron in their successful mission to solve the mystery of the Chamber of Secrets. Hermione is revived after Harry kills the basilisk, but she is distraught to learn that all end-of-year exams have been cancelled as a school treat. Hermione buys a cat named Crookshanks, who takes to chasing Ron's pet rat, Scabbers. Before the start of term, Professor McGonagall secretly gives Hermione a Time-Turner, a device which enables her to go back in time and handle her heavy class schedule, though this is not revealed until the penultimate chapter. Much tension comes into play
Harry Potter clinical teaching, and Joyce Fields wrote that the books illustrate four of the five main topics in a typical first-year sociology class: "sociological concepts including culture, society, and socialisation; stratification and social inequality; social institutions; and social theory". From the early 2000s onwards several news reports appeared in the UK of the Harry Potter book and movie series driving demand for pet owls and even reports that after the end of the movie series these same pet owls were now being abandoned by their owners. This led J. K. Rowling to issue several statements urging Harry Potter fans to refrain