"I found this in your bedroom," Ginny teased, wiggling the book between her fingers. "You didn't exactly hide it and you know how much I love to snoop through your things."
Hermione looked up from her homework to see what book she was on about.
"That's not mine," Hermione pointed out, returning to her work. "You clearly went through the wrong room." She paused before her eyes widened. "You have to put that back! Right now!"
"Why?" Ginny asked, half listening to her as she flopped onto the settee and opened it.
"I think I'm in love with Hermione Granger."
Gringotts: Stolen Diary [Plot]