Question: Which J.K. Rowling book does Emma Watson's character first appear in?

<P0-S0> Harry Potter and the Chamber of Secrets is a 2002 British-American fantasy film directed by Chris Columbus and distributed by Warner Bros. <P0-S1>  Pictures. <P0-S2>  The film stars Daniel Radcliffe as Harry Potter, with Rupert Grint as Ron Weasley, and Emma Watson as Hermione Granger. <P0-S3>  It is based on the novel of the same name by J. K. Rowling. <P0-S4>  The film is the second instalment in the long-running "Harry Potter" film series. <P0-S5>  It was written by Steve Kloves and produced by David Heyman. <P0-S6>  Its story follows Harry Potter's second year at Hogwarts School of Witchcraft and Wizardry as the Heir of Salazar Slytherin opens the Chamber of Secrets, unleashing a monster that petrifies the school's denizens. <P0-S7>  The film is also the last film to feature Richard Harris as Professor Albus Dumbledore, due to his death that same year. <SEP> <P1-S0> Several actors of the United Kingdom and Ireland have voiced or portrayed characters appearing in the "Harry Potter" film series based on the book series by J. K. Rowling. <P1-S1>  Daniel Radcliffe, Rupert Grint and Emma Watson have played Harry Potter, Ron Weasley and Hermione Granger in all the films. <P1-S2>  When they were cast only Radcliffe had previously acted in a film. <P1-S3>  Complementing them on screen are such actors as Helena Bonham Carter, Jim Broadbent, John Cleese, Robbie Coltrane, Warwick Davis, Ralph Fiennes, Michael Gambon, Brendan Gleeson, Richard Griffiths, Richard Harris, John Hurt, Jason Isaacs, Miriam Margolyes, Helen McCrory, Gary Oldman, Alan Rickman, Fiona Shaw, Maggie Smith, Timothy Spall, Imelda Staunton, David Thewlis, Emma Thompson, and Julie Walters, among others. <P1-S4>  Thirteen actors have appeared as the same character in all eight films of the series. <SEP> <P2-S0> Bloomsbury 21 is a series of 21 books published in 2007 by Bloomsbury to celebrate their 21st anniversary. <P2-S1>  The books are limited editions of 21 of Bloomsbury's most famous published works. <P2-S2>  The books have covers featuring a white background with a picture of the original cover of the particular book, tilted in such a way that part of the picture is cut off and appears on the next book in the series. <P2-S3>  When the books are placed side by side in numerical order, their covers form a panorama of the 21 original book covers. <P2-S4>  Each book features an introduction by a fellow author and reading group guides. <P2-S5>  On the spine of each book is its number in the series above the number 21 to indicate the book's place within the series. <P2-S6>  Authors whose works have been included in the series include Margaret Atwood and J.K. Rowling. <SEP> <P3-S0> Hermione Jean Granger ( ) is a fictional character in J. K. Rowling's "Harry Potter" series. <P3-S1>  She first appears in "Harry Potter and the Philosopher's Stone", as a new student on her way to Hogwarts. <P3-S2>  After Harry and Ron save her from a mountain troll in the girls' toilets, she becomes best friends with them and often uses her quick wit, deft recall, and encyclopaedic knowledge to help them. <P3-S3>  Rowling has stated that Hermione resembles herself at a younger age, with her insecurity and fear of failure.