What happens within the walls of an American high school?

In 1970, three children are born at the height of a total eclipse. Due to the sun and moon blocking Saturn, which controls emotions, they have become heartless killers ten years later, and are able to escape detection because of their youthful and innocent facades. A boy and his teenage sister become endangered when they stumble onto the bloody truth.

Part psychological thriller and part provocative character study, A TEACHER explores the unraveling of a young high school teacher, Diana (Lindsay Burdge), after she begins an affair with one of her teenage students, Eric (Will Brittain). What starts as a seemingly innocent fling becomes increasingly complex and dangerous as the beautiful and confident Diana gets fully consumed by her emotions, crossing boundaries and acting out in progressively startling ways. Lindsay Burdge delivers a deeply compelling and seamlessly naturalistic performance that brings us into the mind of an adult driven to taboo against her better judgment.