Marie
She was exploring the mansion some more, and also figured out that she can go through walls. The ghost then made her way into the library. Her eyes sparkled when she saw how big it was. "Eeee~!" She looked at some of the books until she found one about Mimikyu cloaks, because why not? She continued to levitate in the air and opened the book and started to read it. To anyone else though, it would just look like a floating book.
Herschel
During her exploration of the mansion, she stumbled upon the library & walked in. Her eyes widened at the size of the room. Her first reaction was to browse through the books, which she did. Stubbs was wandering through the library himself, just looking around.
Marie
"Geh-" She flinched when she walked in and she dropped the book. It landed right next to Jess. Moni panicked slightly and started flying around, forgetting that she was invisible. She was knocked a lamp over. "Aaah!"
Herschel
She looked at the book that dropped & picked it up, looking for the slot that it goes in. "Don't knock stuff over, Stubbs" She said as the lamp fell in the background. She didn't notice that Stubbs was next to her or the voice, if it was even audible.