Katie never even thinks about 9/11. She was barely a year old when terrorist hijackers flew airliners into the World Trade Center. But when her father is institutionalized because of his belief that the attack was an inside job, Katie becomes drawn into the strange and scary world of conspiracy theorists.

With respectful and careful footsteps, Truthers brings the reader into that world, too, leading to questions about patriotism, civic duty, and the effects belief can have on those around us.