Fable 3: Traitor's Keep Walkthrough Part 3 - Mucking Through the Sewers
You will walk through the sewers a short ways before you come to a gate. Milton explains that he has the one and only copy of the key to this gate. He also tells you that he would not be surprised if Turner was behind this revolt. He is also kind enough to explain that you will be coming out into "The Pit", the lowest level of the Keep. This is where they keep all the disturbed prisoners. These people have no control over themselves and many see them as monsters. You will find out soon enough for yourself though.
He urges the Hero to stay away the cell doors. He will lead you into a room with two electric chairs. Milton explains that Doctors would have people strapped into them, while active, to rehabilitate them. Many called it a Torture Chamber and Milton suspects that a few people who were sane when they came in lost it to these very devices. After that history lesson, he presses on.
Follow him down the corridor that opens behind you. He will lead on. After a short ways, you will enter a room where you will encounter five prisoners determined to take your head. They are easily defeated with a strong attack. Head up the stairs from where the prisoners emerged. At the top, you will find a room filled with Guard corpses. Milton will lament at their loss. A door opens to your right, follow on through.
Just a few more rooms and you will find yourself at the edge of the riots. Immediately you can dive into battle and set into the Rioting Prisoners. There are a good dozen or so in this room alone. Use your stronger attacks to make short work and save as many guards as you can.
Milton will figure out Turner's true motives for sending the Assassin after you at this point. It was to draw him and his best men away so he could start this riot. Unfortunately for the Hero and Milton, that plan worked. Run up the stairs and follow Milton. You will have to fight through several more Prisoners now. Follow the open path forward. There are a few more Prisoners to deal with. After that, keep moving forward. Milton will hear more Guards fighting and will charge on it, inviting you to come along.
You will see a gap in the railing, vault down to join the fray. After you manage to work your way through that horde, you will learn about the location of Turner. He is located in the Maximum Security Ward and those doors have been opened. Milton urges you along so that all have a chance to catch Turner before he can properly freed from his cell.