18. What character was addicted to a drug called yin fen and played the violin?
From Quiz The Characters of "The Infernal Devices"
Answer:
Jem Carstairs
James "Jem" Carstairs was born in Shanghai, China, and was raised at the Institute there until the age of twelve when a demon seeking revenge killed his parents. Before his parents died, the demon had tortured Jem by giving him a drug called yin fen, which he became addicted to. From that point on, with no cure, he was slowly dying from the drug, but he could not stop using it or he would die much faster. With his parents dead, he came to live at the London Institute where he became Will's parabatai. Along with Will, Jem fell in love with Tessa and proposed to her. However, soon after, Mortmain bought up the city's supply of yin fen. Without the drug, Jem's health quickly deteriorated. On his deathbed, Jem chose to become a Silent Brother. Because Silent Brothers could not marry and must leave their former lives behind, he had to end his engagement with Tessa. The two met up on the same day every year on Blackfriars Bridge, until eventually he was cured and the two picked up their relationship.