Divinity: Original Sin Enhanced Edition

Be sure to save in a separate slot before you bring the evidence to Aurey and start talking to him.
We find and receive 3 pieces of evidence - the perfect murder book (in Esmeralda’s room on the 1st floor), a bloody knife (in the basement of Esmeralda’s house), a letter from the chest in the room where Jake was killed.
We go to Aurey and report on the murder investigation:
We report to him about three pieces of evidence.
Then I copy what I read from the Steam trophies. I did everything exactly the same, received the trophy after I killed Evelina in the main quest.
Aurey: Hmm, a knife, a book, a letter: by themselves they seem harmless, but together they add up to a creepy picture. OK. If you claim that Esmeralda did this, then I will have her arrested. You are responsible for this, seeker of the Source!
Us: Regarding Esmeralda, Jack's wife...
Aurey: You don’t have any more evidence, am I right? A good hound knows when the trail has gone cold for a long time - so be a good dog, okay?
A line about arrest appears.
Us: the legion must arrest someone.
Aurey: Who should the legion arrest?
We: Mistress Esmeralda.
And then you can’t be unanimous.
1 hero - We cannot arrest her based on circumstantial evidence alone.
2nd hero - Indirect? Ha Everyone in town knows that Esmeralda wanted to kill Jake.
1 hero - in a choice of 4 points (intimidate, charm, convince, and okay, be it your way) - okay, have it your way.
Aurey seeing the disagreement: You failed to convince me, but this evidence is too serious to simply brush aside - even if it was collected by a layman. So be it - within an hour she will be put under arrest.
We: (more)
Aurey: But even if this is so, the pathetic evidence you have collected is unlikely to help convict her. I need her recognition. Once she's behind bars, make sure she confesses to the crime!
Us: The end.
The main task is not to be unanimous in opinion, if both heroes are told that they need to be imprisoned, the Councilor’s Wife task ends, if there is not enough evidence, the Councilor’s Wife task ends.

We kill Evelina in the lair and return to Aurey, he runs into prison and tells Esmeralda that she is free. As soon as their dialogue ends, the trophy is yours.

The trophy has been received. And right the first time.
Attention! Very important! This tip is part of the Valiant Difficulty Guide. But you can use it, just like the independent instructions, to get this trophy.
Now to the details.
We go to Esmeralda (her house is displayed on the map) and talk with Esmeralda until the end. After the conversation we get the “Prime Suspect” trophy. Then you go up to the second floor of her house and take the key from the table. You also open the chest and take away an item with Charisma +1. You receive the trophy “As a keepsake.” Then we go to Aurey (the house is displayed on the map) and talk with him. In a conversation with him, he will say that everyone in the city and even the crabs on the shore are convinced that it was she who killed Advisor Jake.
Then return to Esmeralda's house and go inside from the back door. On the first floor in the room, find the book “Planning the Perfect Murder” and take the key to the chest in the tavern. And in the basement you find a bloody knife (press the button on the wall and a secret passage will open).
We go again to Aurey and talk with him again about the murder. And we tell him about the book and the bloody knife. He, in turn, will tell you that there is not enough information for an arrest and you should continue your search. Pay special attention to the last one!
Next we run to the crime scene, to the King Crab tavern.
Attention! Correct answers in a conversation with Mendiy and in which you activate the first line every time! Answers: 1. Of course! What a seeker of the Source... 1. Correct! After all, we live for adventure! (Bravery); 2. In fact, wealth... 2. It's not for me. It's just vanity. (Altruism); 2. There is nothing shameful in that... 2. That's right. We serve a just cause... (Diligence); 1. Join the guild, make the world a better place... 1. Me too! Let all the riches of the world become ours! (Bravery).
Open the chest in the room where the murder took place and we find a letter from the Duke of Ferol. We read it and go to Esmeralda.
When talking to her, tell her about all the evidence you found against her. She will give you explanations against them, but after that the conversation will turn to Evelyn. Talk about it until the end!
Attention! Very important! After talking with Esmeralda, do not go to Evelyn! And return to Aurey!
In a conversation with the captain, show him the letter you found and then choose: 2. The Legion must arrest someone; 1. Mrs. Esmeralda. Follow-up responses: 1. Arrest her! Three clues are more than enough... 1. Correct! Solid evidence or not - what difference does it make?... Then Aurey will say that she will be arrested within an hour.
Go to Esmeralda's house and watch as she is arrested. Next, go to the prison and talk to Esmeralda through the closed door. And again she will mention Evelyn. And after talking with Esmeralda, you go to the Teliron hospital.
Evelyn will no longer be in the hospital. Find the key to Evelyn's house and go there.
In the house you find a “spell of the hidden” and a book in which the Pythia is mentioned. Attention! This evidence does not appear in communication with Aurey. Therefore, you don’t have to go to him.
After this, continue through the "Valiant" difficulty level.
For those who missed this trophy - you know what to do next.