If you could read my thoughts, you wouldn't be smiling. Samantha McAllister looks like the other popular girls in her junior class. But hidden beneath her smooth hair and perfectly applied makeup is a secret that her friends would never understand: Sam has pure obsessive-compulsive disorder and is overwhelmed by a stream of dark thoughts and worries that she can't turn off. Questioning every step, every thought, and every word makes daily life a struggle, and it doesn't help that her long-time friends become toxic at the slightest sign of a wrong outfit, wrong lunch, or wrong crush. Still, Sam knows she would be truly crazy to leave the protection of the most popular girls in school. When Sam meets Caroline, she has to keep her new friend with her refreshing humor and lack of style a secret, just like her weekly visits to her psychiatrist. Caroline introduces Sam to Po.