Disappearances. And Ginny trying to make Harry jealous, even though by this point she's kind of losing hope.
The penultimate letter.
Dear Harry,
We got caught. We were found and Neville was punished, but everyone thought I had orchestrated it. The punishment hurt, and it wasn't worth it at all. It's locked up at Gringotts, with who-knows-what protecting it. No one will have a hope in hell of getting it out of there.
Luna's not here. She didn't come back after the holidays. Neville has several conspiracy theories, and at first I rejected them, but they're starting to sound very plausible indeed.
What worries me is the teachers lack of concern. Lots of people have left the school, but Luna kept saying she wouldn't leave, ever. She was absolutely certain she would wait out the year at Hogwarts, no matter the consequences. She very much believed in you, Harry. Very much.
If Luna can get caught, then what will happen to us? What will happen to the blood traitors, and the muggle-borns, and the troublemakers?
Neville's really helping, though. He's always here, always dependable, I know I can rely on him when I need to.
Ginny