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 Half-Blood Prince (film) film stars Daniel Radcliffe as Harry Potter, alongside Rupert Grint and Emma Watson as Harry's best friends Ron Weasley and Hermione Granger. It is the sequel to "Harry Potter and the Order of the Phoenix" and is followed by "Harry Potter and the Deathly Hallows – Part 1". Filming began on 24 September 2007, leading to the film's worldwide cinematic release on 15 July 2009, one day short of the fourth anniversary of the corresponding novel's release. The film was simultaneously released in regular cinemas and IMAX 3D everywhere except North America, where its IMAX release was delayed for two