 She also introduced a new character, another tenant in her building named Gustaffsen.Gustaffsen is a scientist who was working on a new super-coolant, which was making the drips that Violet had noticed.Gustaffsen and Cassia, one of the newer puzzle scribes at the Perplex City Academy, had informed Violet that their mail was being delayed, despite the Perplex City postal service guaranteeing delivery within five hours.