Samantha McAllister seems like any other beautiful, popular girl at school, but she has a secret--she has Purely-Obsessional OCD, which means she second guesses and worries over every little decision she makes. Her popular friends don't understand when she makes a fashion mistake, but a new friend named Caroline knows that Sam's fashion choices aren't mistakes--they are just who she is. Caroline introduces Sam to a whole new world at school, one where she can truly be herself.