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 and the Deathly Hallows "They're very British books, so on a very practical note Harry was going to find biblical quotations on tombstones ... [but] I think those two particular quotations he finds on the tombstones at Godric's Hollow, they sum up – they almost epitomise the whole series". "Harry Potter" pundit John Granger additionally noted that one of the reasons the "Harry Potter" books were so popular is their use of literary alchemy (similar to "Romeo and Juliet", C. S. Lewis's "Perelandra" and Charles Dickens's "A Tale of Two Cities") and vision symbolism. In this model, authors weave allegorical tales along the alchemical