Elsa's hands shook and asked the servant, "Who gave this to you? Take me to that person!"
Her voice was loud and sounded angry, scaring the poor servant. "I-I'm sorry, My Queen. I do not know who is it from. It arrived with a carrier pigeon at the culverhouse. I-If you want I could t-try to ask the birdkeeper for more information."
"Nevermind. I want you to keep this a secret for now. The King is very furious as of the moment and I don't want you to get scolded. I will be the one to tell him, do you understand?" Elsa tries to convince the servant for she doesn't want anyone to know about it.
The letter was addressed to her and it just means that the demon king has something up his sleeves and she will find that out on her own.
"Y-Yes, My Q-Queen. T-Thank you for looking after me. My lips are sealed, I swear on my mother's grave," the servant then acted zipping out his lips.