This is another very simple one. Go to the Bouleuterion of Athens to meet with Perikles’s contact. Speak with the informant about the ostracism, and then make your way to the Logismos building in the Agora. When you reach the building, use Ikaros to scout the area. Tag all of the guards in the vicinity and then jump the wall from the western side. From this position you will havbe a good view of two patrolling guards in the courtyard. You can take them out with ranged skills or stalk them from the grass to attempt a clean assassination.

Once they are dead you will find one more guard at the door from the courtyard. Assassinate him to clear the way into the building, where you will find the Ostraka’s marked on the ground floor and the first floor. When you have both, take them back to the informant. A brief cut scene will then initiate, after which you have a brief opportunity to speak with Socrates.