Council, The Guide

The quest starts with a confrontation. Most of the steps are easy aside from the last one. The only correct final answer is "finding my mother with one hand less" but mentioning your visions, if you have some blunders left, provides interesting insight into the storyline.
Winning the confrontation rewards you with the Guardian trait and +1 in Occultism.
After the cutscene, head to the conference room. Before you do anything else, talk to Péru and use Psychology to get more information out of him. Look around the room for items, then go talk to Mortimer.
Several linguistic skill checks will occur during the conference, as the guests will sometimes communicate between one another in a foreign language. To gain a better understanding of the scope of Mortimer's plan, remind Godoy of the threat posed by the US and reflect on Mortimer's maps when Piaggi brings up the Pope.
After the conference you are presented with a choice.
Leave with Holm
Leave with Holm
Following Holm gives you an opportunity to reveal Mortimer's full plan to his adversaries. This earns you Holm's trust.
Stay with Mortimer
Stay with Mortimer
This part is more straightforward. Just follow the conversation until you regain control of your character.
It's now time to search other people's rooms. Most of them are open, so be sure to check any room you haven't visited before.
Read the letter from Holm in Wöllner's room. The locked chest there can be opened with the word zinc.
Check the unfinished book in Napoleon's room.
Enter Péru's room and talk to him. Choose to stay silent and he'll agree to talk to you. Mention that he's afraid for others in order to keep the conversation going.
If you left with Holm, search Godoy's room first for a painting and a letter, then search Washington's room and keep the locked suitcase for last. Washington surprises you in his room, leading to a confrontation where you get an opportunity to blackmail the