Mona

I really like this story so far. It's very interesting and I can't wait to find out what happens to Mona. I'm doing an opener tomorrow and if we don't have enough time to discuss this I thought of putting it here. What is the significance of having Sherman Matsumoto reappear out of the blue while Mona is doing the phone calls? Do you consider him a main character? Is he supposed to teach Mona to not be Americanized?