After meeting back up with your team, you'll be off to find the Surgeon who is to be your fourth team member. Leave the Inn and meet with Charles across the street. You'll try to enter the Surgeon's home but it will be locked and nobody is home. It's time to head into the city and try to find your man.
Eavesdropping
Outside, you'll see a couple of people in the distance marked with orange markers. An orange marker indicates a person who must not be killed. Walk into the circle that is marked to hear their conversation. When they stop talking and look at you, you must blend in with the crowd to continue listening. Just to your right, you should see a group of men leaning on the wall. Stand between them to blend in.
After you've heard the entire conversation, a new destination will be marked. You'll have to head to that next marker to gather more information. When you approach, you'll see that the marker is leading towards a church rather than a person. Climb to the cross at the highest point of the church and from here, you can synchronize which will reveal an area of the map for you. Hit the buttons as prompted on screen to synchronize and then leap off into the hay below.
Now that you know something of the land nearby, make your way further ahead to the next orange marker. You'll find another couple of people talking. Blend in as you did before with the men standing against the wall to the west of these two people. Soon, their conversation will end and another conversation will be marked. Go over and listen to the soldiers talking nearby. You can sit on any of the benches inside the circle to blend in.
They will finish their conversation and a final set of orange markers will appear in the distance. Head over to the square where these soldiers are patrolling and follow them around at a distance to listen in. When they are done talking, you need to try and find this missing man.
The Rescue
Northeast of your position, you'll find an area marked in green with a large red square in the middle. Inside the red square, if you are seen in any way, you will attract attention or be attacked instantly. You need to get through this area undetected but that can be a little difficult. There are enemies on the rooftops and in the streets so the best way to go about this is to approach from the water. Find a safe place to enter the water and then stick to the coast as you approach their position. Remember that you can submerge yourself if someone might notice you but you can only do so for a short period. Approach the docks and try and pull guards into the water. This will give a little more room to get to the central structure.
Once you've cleared as many guards as possible without drawing attention, try and find a path through the remaining guards to the building. When you come up to the door, you'll find that it is locked and the key is being carried by one of the guards. Find one of the marked guards and sneak up behind him to pick pocket him. If there are any guards on the docks still left, they make for the best targets because they seldom turn around. Walk up behind them slowly and then follow the prompt on screen to pick his pocket. With the key in hand, head back to the building and open the door.
After the cutscene, you'll regain control and have three men between you and your friend. Walk up behind either of the first two and assassinate him. Your friend Lee will take out the other guard and then you can finish the third man yourself.
