The scraping sound of a ball rolling back and forth across the pavement is the only sound Riley Ratton hears as he walks home, relying on his white cane. It's late at night, and he struggles to see anything through the emptiness obstructing his vision. He knew better than to stay out too late, but he had almost been done with his term paper, and didn't think it'd be so dark by the time he left the public library.