…Despite the terrible events that took place in the city, in the evening all the townspeople went to a masquerade ball organized by an unknown person. Well, why not go, there will be free food and drinks, and you won't get bored with them...
“My dear masked man, my little puppet, don't be so stubborn – the masquerade is not the way for you. Accept the fact that I am your master and your brain. It would be better for us to work together.
Kostyan, I think we understand each other.
Puppeteer”
By the way, the style of the note is very similar to Hostor's.