Sitting in their comfortable library after dinner, Agnes confides to her husband that she sometimes worries about losing her mind. But her husband,Tobias, assures her he knows no saner woman. In short order the couple are visited by Agnes's younger sister a bitter, malicious alcoholic; by the couple's much married daughter and by Tobias's best friend and his wife, both of whom are frightened by something they cannot identify. The visits force Agnes and Tobias to re-evaluate all their relationships and to recognize that they must maintain a delicate balance between sanity and madness.
