Who is Sarah Wolpert from Sacred Hunger and what is their importance?

Sarah Wolpert is the love interest of Erasmus Kemp. She is pale and beautiful, as well as out-spoken and flirtatious. She is the cause of many mood swings for Erasmus. Erasmus, in the end, does not marry her, because he is unwilling to work for her father and her brother Charles. When Erasmus is found to be a pauper, she believes that he never really wanted to give something to her; he wanted to have her as something to add to his own wealth. In her mind, she was not as important to him as clearing his father's name and regaining his family's wealth.