This quest begins immediately after 'To Kill or Not to Kill' if you chose to follow the plan of Brasidas. Make your way to the house of the Archon to aid Brasidas in his investigation. After a brief exchange, a civilian and a cultist will approach the house. Once you have overheared their conversation, follow them north to The Scorched Tree to learn more about the contents of the letter that was mentioned. As you approach the drop off point, you will have to kill two cultist guards before you can free the prisoner. The guards are standard and will not be difficult to defeat. After speaking with the prisoner you will be attacked by three more cultist guards. Again, they are not difficult opponents and you can deal with them easily by using AoE special attacks. Once they are all dead, make your way to the hideout to the east. When you reach the entrance the quest will complete.