The Haunted Doctor
From The Fifth City Wiki

"Earnest, learned, prone to jump at loud noises."
The Haunted Doctor is a doctor and revolutionary, originally from the Surface, who gave one of his eyes to a spider-council in exchange for knowledge. The visions the council shared with him led to his joining the ranks of London's anarchists. He rose high enough in the ranks to learn of the Anarchists' end goal, the Liberation of Night, and thought it was the only path forward.
He was a well known doctor in London, and was able to get close to people the anarachists wanted killed. Eventually, he was told to kill one fo the Calender Council, likely March, and after this he regretted his choices. Now he's searching for a new path in life.