|“||Are you sure you want to go through with this?||”|
–Brother Jeremiah, The Mortal Instruments: City of Bones
When Clary Fray, the daughter of Jocelyn Fairchild arrived at the New York Institute, Hodge Starkweather considered the possibility that Clary knew where the Mortal Cup was hidden deep within her blocked memories. He reached out to the Silent Brothers and told them their situation. Shortly after, the Brothers made their preparations, and Jace Wayland escorted Clary to the City of Bones.
Brother Jeremiah was the Silent Brother who greeted the pair, and he asked Clary if she was certain that she wanted to go through with the ordeal. When she confirmed, he opened the gates to the City of Bones and brought them in. Once in the Hall, the other Brothers came in for the ritual, and Jeremiah guided Clary to the center, to stand on top of the Voyance rune on the ground and below the hanging Mortal Sword from the ceiling, and told her to "listen with [her] eye". Afterwards, he joined the other Brothers around Clary. When Clary fell and began writing on the ground, Jeremiah came forward to check on her and see the writing as Jace uncovered it.
Brother Jeremiah had pale white skin littered with pale scars left behind by runes, among other powerful symbols. His head was shaved, he had no eyes—only indentations where they should be—and his mouth was sewn shut.