The Doubt Factory

A teenager girl from a well-off family is living a life without worries, until some day, incidences happen at her school - a stranger disrupts her life and ask her to question her father. She is kidnapped, discover other teens, all bent on converting her into believing her dad is evil. He is the owner of a "Doubt Factory" - meant to help prolong dangerous drugs from being taken out of the markets. She betrays them, but then does her research and investigation and discovers that they were right. 
 She tries to find them back, and find the first stranger, and they fall in love with each other. She betrays her father and manage to still information about his clients to disclose to the public. 

It is a young adult novel, and so it's stylishly not very rich. The story is gripping though, and it's based on real facts - the doubt factories do exist. 
I wouldn't recommend it to an adult, but it's a good book for a teenager, a bit like a Cory Doctorow book