The guests are invited to celebrate the Mistress's betrothal. Although the sender of the letter may seem anonymous or perhaps from the Palazzo's household, it was actually sent by someone who lived in the mansion. I don't know if it was really from the Mistress or if someone else was interfering. But, isn't it clear that the people closest to her can interfere in this matter?

Then regarding the reason the party was held because of the wishes of the Mistress.
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The fact was discovered that the Mistress, Miss Serafina = Miss Serval. It is possible that the Mistress was never seen at the party because she was already dead (Miss Serval was found dead on the second day). Also, didn't show up on the first day because her fiancé did not attend the party.
Back here, it means it can be said that Mistress's brother is here, Miss Serval's brother, Mr. Gepard.


The autopsy results said that Miss Serval's death was due to poisoning. Considering that there was a brew of flower tea in her room and she had drunk at least half a cup, it meant that she had indeed been poisoned, whether intentionally or unintentionally. Seeing how honey was given to everyone, it meant that the flower in the cup was indeed the cause. The honey in the tea was deliberately given to everyone because it had a hallucinatory effect, with the aim of the guests believing rumors of supernatural things in the mansion.
Other evidence was found in Miss Serval's room, several romantic letters as well as a ring with flowers.



