But I hate blood! 25

Avina wished she could take the book with her, but she didn't want to risk someone being suspicious of her either. But it was plenty suspicious enough that she was in the library in the first place. Especially since she was certain not many people knew how to open the door. She took a risk exposing herself to Ruby already.

Putting the book back into its rightful place, Avina made her way back to find that secret entrance. She had imagined it in many ways. A secret button, or maybe a lever, but she never expected this. It was a vent.

Avina was staring at some century old metal vent. It blew cold air when it was hot, and hot air when it was cold. Made sure the mansion was well warmed and cooled when necessary, and the last place she had actually thought it would be.

If it was a simple vent, why did she have to go all the way to the library to get to it!?