Mary Turner is a self-confident, independent young woman who becomes the depressed, frustrated wife of an ineffectual, unsuccessful farmer. Little by little the ennui of years on the farm works its slow poison. Mary's despair progresses until the fateful arrival of Moses, an enigmatic black servant. Locked in anguish, Mary and Moses'master and slave'are trapped in a web of mounting attraction and repulsion, until their psychic tension explodes with devastating consequences.