Dennis feels out of place after moving to a gloomy town where his dad accepted work at a controversial chemical plant. He struggles to fit in and soon senses something may be very wrong with his new middle school. When he finds the journal of a student who went missing decades ago, he begins exploring the haunting truth behind the disappearance. Everything points to a dark and strange reality lurking behind the walls of the school itself. Dennis must uncover a long-buried secret if he hopes to make it through the year.