What do Susan Carol and Stevie overhear in Chapter 5? What conflict do they face?

Stevie and Susan Carol realize what they've just overheard is someone blackmailing the best college basketball player in the country to lose to Duke in the Final Four game on Monday. They struggle with right and wrong. They know what they overheard is wrong and that they need to tell someone, but they don't know who to tell who will believe what they heard.