Once you begin this mission, you will have to complete the chapter before going onto other missions in the game.

Upon returning to Athens, a cutscene will play. The city is under siege and a plague has hit. After the cutscene, go to Aspasia in Perikles's Residence. Along the way, Phoibe will meet with you.

Speak with Aspasia; she will ask that Perikles is checked on. Go upstairs and interact with his door. Have a short conversation with him and follow him to the balcony.

After the conversations with Perikles are done, go back downstairs to speak with Aspasia. She will ask that Phoibe is check up on as well, as she sent her out to find more information about a ferry so she and Perikles could escape the city. After this conversation, the mission will end.