Build a movie plot around this: What does Hermione suggest they use to question Malfoy? Polyjuice potion
The answer to this question is:
While home with the Dursleys for the summer, Harry Potter (Daniel Radcliffe) is not getting any mail from his friends, Ron (Rupert Grint) and Hermione (Emma Watson). On his twelfth birthday (July 31) Harry is visited by Dobby, a house-elf, who warns Harry that he will be in mortal danger if he returns to Hogwarts. Harry ignores Dobby's warning and is determined to return. It turns out that Dobby has been collecting Harry's letters to make it seem as though his friends had forgotten him, hoping Harry might then not want to return to Hogwarts. Seeing that he will have to use force, Dobby decides to destroy, by the use of a charm, a large cake that Aunt Petunia (Fiona Shaw) has baked for an important dinner party attended by Vernon Dursley's (Richard Griffiths) boss and his wife. Harry is blamed by the Ministry of Magic for Dobby's charm, and is told that if he does magic outside school again, he will be expelled. On learning that Harry cannot perform magic outside school, the Dursleys, previously fearful of his wizarding, lock Harrys books and wand away and Vernon Dursley fits bars onto his bedroom window, making Harry a prisoner.A few days later, Fred, George (James and Oliver Phelps) and Ron Weasley come to his rescue in their father's enchanted Ford Anglia. After a pleasant summer together in the Weasley house, everyone heads to Platform 9 to take the Hogwarts Express back to school. To their shock, Harry and Ron are unable to enter the barrier between platforms 9 and 10. In desperation, they fly to Hogwarts in the car, crashing into the Whomping Willow and damaging Ron's wand. The semi-sentient car ejects them and their belongings and disappears into the Forbidden Forest.Harry soon finds he is the unwanted centre of attention of three people: the vain new Defense Against the Dark Arts Professor, Gilderoy Lockhart (Kenneth Branagh), admirer Colin Creevey (Hugh Mitchell), and Ron's sister, Ginny Weasley (Bonnie Wright), who fancies Harry. Events take a turn for the worse when the Chamber of Secrets is opened...