Katie Wallace has never given much thought to 9/11. She was only a year old when terrorists struck American soil. But now her dad has landed in a mental institution after claiming to know what really happened. He insists the attacks were part of a government conspiracy. And he claims that Katie is living proof: the lone survivor of a massive cover-up. Hoping to free her dad, Katie sets out to investigate his bizarre claims. Soon she's drawn into the strange and secretive world of 9/11 conspiracy theorists known as the Truthers. What is fact and what is fiction? Katie no longer knows what to believe.