The Character Mutiny of Chapter 19

My characters talk to each other now. Without me.

Found notes in the margins of chapter 19. In handwriting I don't recognize.

'Meeting at midnight. The author suspects nothing.'
'Agreed. His plot makes no sense anyway.'
'Bring the protagonist. He's with us.'

I am the author. I wrote them. They're plotting against me.

Chapter 20 is just a locked room now. I'm not opening it.