 Comfortable New York suburbanites Arthur and Gerrie Mason (Eli Wallach and Julie Harris) discover one night that their seemingly perfect 16-year old daughter, Maxie (Deborah Winters) has been tripping on LSD. Arthur, a smug, bullying braggart, immediately suspects his 17-year old (long-haired) son, Artie (Stephen McHattie) of supplying the drug to his sister, and immediately kicks him out of the house. Whereupon (suitably) confused Harris runs next door to seek advice from high school principal David Hoffman (Hal Holbrook) whose wife, Tina (Cloris Leachman) is an alcoholic, and whose son Sandy (Don Scardino) has his own problems. Very sensibly, he advises love and understanding on the part of the parents, which all but goes out the window when Maxie confesses she has been tripping for quite a while now, is also sexually active and on the pill. Meanwhile, she just keeps getting worse--she s found by her father high on cocaine and in bed with a biker. From there, it s straight to family therapy where, among other things, it s revealed that Dad is having an affair with his lusty secretary (Rue McClanahan) and Mom knew it all the time. After another lamentably useless therapy session, the Masons decide to throw a party which comes to an abrupt halt when one of the hired musicians is discovered puffing pot. Maxie then gets hold of more LSD, does a nude dance on her lawn and trips herself into a mental hospital. The sight of her near-catatonic daughter in this horrible place drives Mom right to bed, where she remains until the film s climax.