Ok so Mielle with the help of Berry put poison in the tea of Aria, because of that there will be an investigation to catch the culprit (obviously Berry, ordered by Emma, the maid of Mielle). Because of that Emma will be questioned and put in the court, and killed because she attempted to kill Aria.
Mielle it's in a status of despair and she will show her real face.
If u want to know something more tell me
Aria revealed her self as Inventors A.
In the end Mielle attempted to kill her own father (and tried to blame Aria for that, but nobody believed), the count in fact was put in a coma. After that will be a sort of misunderstanding/fight (if u want I can explain better) between the Empire of Cora and This empire (I'm sorry, I don't remember the name) that put Isis and a lot of aristocrats in guillotine for have betrayed the Crown Prince and the empire. Mielle and Cain were saved by Aria.
The Roscente family become a family of commoner and Cain (her brother) became the count of the family.
In the meantime, The countess (aria mother) encounter a client from the time when she was a prostitute, that client turn out to be the father of Aria a marquise of Cora.
Aria also explains to Asher all the truth behind the hourglass.
Mielle, at first under the suggestion of Aria (Aria had set a trap for her), tried to poison the tea of Annie (maid of Aria that were bullying Mielle) but ended up to poison her brother Cain, and because of that he died.
After that she will be put in guillotine and the count attempted suicide.
Roscente family is dead.
Corin (now revealed the name of Aria's mother) and Aria owned a Mansion thanks to the financial of Aria.
It's not everything, but I tried to explain at the best
I love this story so much.
I'm almost done with reading the novel, I'm on chapter 240 and the story end at chapter 288. But I know almost everything, so If you want spoiler just tell me the characters that u want.