Disclaimer: One day, if J.K. Rowling decides that she wants to adopt and wills the Harry Potter copyrights to her new kid, I might own the series. But until then, I will just have to deal.
Luna Lovegood knew a secret.
Actually, Luna knew many secrets. She knew that Hermione no longer loved Ron. She knew that (through Ginny's fervent denials), the redhead still loved Harry. She knew that Draco Malfoy was not, is not, and would never be, a Death Eater.
Spend enough time on the sidelines and you get really good at reading people. Luna could thank her constant position as an outcast for this helpful skill and at times like these; everyone needed all the skills they could salvage.
Last year, she saw the beginnings of war, sad goodbyes, and the dwindling end of hopeful romances. But this year...this year, things were much more interesting. Luna didn't like to intrude upon other people's messy affairs. Intruding led to judging, and Luna Lovegood had been judged enough times to make her hate the very existence of the word. However, there were some things you couldn't quite ignore.
Take the new secret for example- Luna couldn't help but notice the key that dangled on Ginny's neck every day. The fact that Ginny always subconsciously touched it didn't make things any better. The first time Luna saw the green stone at its tip, she was sitting with Ginny next to the lake, carefully thumbing through Hogwarts, A History. Naturally, the book reminded her of Hermione Granger. And naturally, when she thought about Hermione Granger, she could not help but be reminded of Draco Malfoy. The two had been utterly in love with each other during their sixth year after all; even if Luna was the only one smart enough to know. Thinking of Draco Malfoy led her to thinking of his house color and as Luna squint her eyes to get a better glimpse of the tiny emerald, she could not help but think of how fitting it would be if the color green was a clue to the origin of the necklace.
Luna could guess that Ginny had her own theories about its origins, but she also knew that Harry Potter would never give anything so blatantly obvious to a girl he was trying to protect. A necklace that intricate had to have some sort of charm on it and any Death Eater would be able to trace it back to him. The Boy-Who-Lived (and hopefully would keep on living) had a bounty the size of the United States over his head after all; the Dark Side would attempt to trace all of the discovered artifacts back to him.
Luna was sure that whatever spell was on the key would lead her to its procurer. She needn't have bothered if Luna didn't fear for Ginny. What if the key was sent by a Death Eater? Or a spy? So, a simple Switching Spell did the trick while Ginny was in the shower later that day.
Luna had to admit. She was impressed.
The key didn't contain a spell and it did take several tricks to unlock its secrets; but her mother had taught her to recognize certain things hidden in inanimate objects and Luna Lovegood wasn't a Ravenclaw for nothing.
The key contained memories.
Luna Switched the key back. She had a pretty good idea of what the memories were, so she did not violate the protection of the mini-pensive.
After all, the only person who could've performed such a complicated spell was off saving the world with her two best friends, and she didn't need any more trouble.
So Luna Lovegood decided to keep an eye on Hermione Granger's memories for her.
A/N: And the plot thickens!! Any theories yet? Please Review!!