“Don't you want to know how Ginny got hold of that diary, Mr. Malfoy?” said Harry.
Lucius Malfoy rounded on him.
“How should I know how the stupid little girl got hold of it?” he said.
“Because you gave it to her,” said Harry. “In Flourish and Blotts. You picked up her old Transfiguration book and slipped the diary inside it, didn't you?”
(Harry Potter 2, p336, US edition)
Some people say that negative question has a connotation of accusation, but I’m not sure. I’d be happy if you could explain the following points.
- Is Harry accusing Lucius Malfoy?
- What is the radical difference between “Do you want to know” and “Don’t you want to know”?