Why are you doing this? It's useless anyway, he said.

Well, I'm not the one who ask you to follow me.

If I don't follow you around, I can't even imagine the crazy things you would do, he said, frustrated. He started to sweat a lot. I'm tiring, I guess. But it's in the middle of summer and I'd been dragging him all over the neighborhood. Well, he chose to follow me.

I'm tired of being a puppet. They say the secret lies beyond this door. I'm going in. Are you?

He sighed.

This is going to be the last time. Tell your brother that he has to babysit you himself next time, he said.

Tell him that yourself.

Could be a fantasy, or a psychological thriller. A weird, crazy who is an adopted child of a rich family. She is sort of being used by the family to hide whatever dirty secret they have without her knowing. She walks around in skirts but climbs over stone walls or gets into a secret dungeon without hesitating.

Edit: also, she is cranky, blunt, wicked, leaning towards being sadistic, with lots of dry humor.