[Sometime During the Beginning of the 2nd Year]
"Hey Ginny."
She glares at me and my corner. "What?" I don't have the friendliest tone when starting conversations.
Still. "Can you do me a favor? Check your belongings and see if there's a beat-up looking black notebook in there somewhere."
That request got us some weird glances from everyone in the common room.
"Uh…?" Ginny glances at Percy for help, who pretty much tells her (through a defeated shrug) to go do it for the poor crazy kid.
"How would you know what's in her luggage?" Ron demands of me.
I frown. "Call it a hunch."
…
Naturally, there was.
"I never had something like that." Percy mutters when Ginny voices her opinion that it could've been from her brothers. "I can't imagine the twins having something like this, either."
"Yeah…I'm not surprised." I nick it from the table. "Malfoy Senior slipped it into your stuff. Where's McGonagall?"
"She should be in her office." A seventh year replies.
"Wait, why would he do that?" Harry asks me.
"Vengeance is a dish best served stupid; you," I point to the seventh year. "Guide me."
…
We visit McGonagall's office, explain the origins of the notebook (or rather lie about having found the notebook on our travels), and get her to bring us to Albus Dumbledore.
We then make the case that this notebook is a Horcrux (and McGonagall nearly kills us on the spot for knowing about that branch of magic) belonging to a certain Tom Riddle, and should be destroyed immediately.
We lose 100 points for having an article of extreme dark arts in our procession, and gain 100 points for recovering an article of extreme dark arts. Ginny is not even implicated.
And thus ends the Chamber of Secrets.
{ === End What If? === }
Author Notes: This is what would happen if Ash is well adjusted and is willing (or able) to make use of prior knowledge however he wants. Naturally, it is boring as a story and thus we will forget this ever happened.