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 Philosopher's Stone (film) and begins his education. The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger. Warner Bros. bought the film rights to the book in 1999 for a reported £1 million ($1.65 million in 1999). Production began in the United Kingdom in 2000, with Chris Columbus being chosen to create the film from a short list of directors that included Steven Spielberg and Rob Reiner. Rowling insisted that the entire cast be British and Irish, and the film was shot at Leavesden Film Studios and historic buildings around the United Kingdom.