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 (film series) was released in November 2010, and "Part 2" was released in July 2011. Five of the series' eight films are among the 50 highest-grossing films of all time, with "Harry Potter and the Deathly Hallows – Part 2" the highest-grossing film in the series and one of 36 films to gross over $1 billion, ranking at number ten. Without inflation adjustment, it is the third highest-grossing film series with $7.7 billion in worldwide receipts. Late in 1997, film producer David Heyman's London offices received a copy of the first book in what would become Rowling's series of seven "Harry Potter"