The Doubt Factory by Paolo Bacigalupi

Alix Banks is a model teenager--successful in school, good at sports, responsible for her kid brother, and very, very rich.  The problem is, all of that wealth and privilege comes at a cost, the way her father earns his living.  Alix is stalked and eventually kidnapped by a group of kids--orphans--who want her to know about her father and to help them "get even" for the damage he has done to them and to others like them.  The book is a roller coaster of plots, back-up plots, con jobs, betrayals, and dangers as the kids take on the powers of the public relations industry, pharmaceutical companies, private security firms and more.  Bacigalupi wraps serious social problems in a plot filled with action and ethical dilemmas.  Great read!