In 2009, in Cleveland, Ohio, police discovered the bodies of eleven women decomposing in and around the home of known sex offender Anthony Sowell. The stench of death had hovered over the neighborhood for two years prior to the discovery, as the women's bodies laid in the house and yard rotting. With unprecedented access to the surviving victims, Unseen tells a chilling story about the invisibility of women on the margins of society and raises troubling questions about why this killing spree went unnoticed for so long.