City of Fallen Angels by Cassandra Clare is the fourth book in the Mortal Instruments series. In it, Simon Lewis tries to get used to his new life as a vampire, while Clary seeks to establish a steady relationship with Jace. Lilith, a demon, seeks power in New York. The book opens with Simon at the age of sixteen. It’s been two months since he was turned into a vampire, and he’s learning to control his blood lust, while also trying to live the life of a typical teenager. For him, this means continuing to play bass in his band. Almost all the other band members know that Simon is a vampire, which helps. The only one who doesn’t know is the new vocalist, Jordan Kyle. Unfortunately for Simon, his mother finds out about his condition.