Fifteen-year-old Raquel Falcone is, as one of her classmates puts it, the kind of kid who has a tendency to be invisible. That is until the night she's hit by a car and killed while walking home from the movies.      In brief, moving chapters, we hear about Raquel from her classmates, her best friend, her family--and the woman who was driving the car that struck her.       The loss of this seemingly invisible girl deeply affects her entire community, proving just how interconnected and similar we all really are.