She shook her head. "Since Ron died, I haven't been able to think straight," she said in a low voice. "Putting together a coherent sentence takes the same effort as one of Snape's penalty essays used to. I was doing better, in the library, a few nights ago -- but then Draco turned up and now I'm all brain-fuzzed again."
The book was where Marcus said it was; Hermione Accioed it down and bent her head over it to hide her flush of shame.