Colleen is feeling the heat. It's her final year of school, and university applications and deciphering boys' texts have turned life into a pressure cooker. Colleen and her friends are expected to somehow keep it all together – until they can't.

The first victim is gorgeous, popular Clara who starts having loud and uncontrollable tics while her horrified classmates look on. More students follow suit with new symptoms: seizures, body vibrations, violent coughing fits, and hair loss. The media descends as school officials, angry parents and health experts scramble to find something, or someone, to blame. But there is one thing no one has factored in: the school's town was once Salem Village, the site of a similarly bizarre epidemic among teenage girls three hundred years earlier – and it seems history is about to repeat itself.