Marilyn Jordan (Susan Anspach), an American-born housewife, mother, and socialite living in Sweden, is crumbling under the weight of her own existence. She deeply resents her husband Martin's (Erland Josephson) frequent holiday absences and his indifferent attitude toward their two children ("If they are going to grow up in today's world," he admits, "it's about time they faced the fact that nobody keeps promises anymore"). Moreover, Marilyn's eccentric father (who believes he is Buffalo Bill and fires off guns in the house to prove it) and her children -- who hatch an outrageous plan to set up a dating service for senior citizens -- start to drive her completely around the bend. Marilyn feels herself domestically imprisoned -- encased in a bell jar. Her subsequent behavior grows not simply eccentric, but irrational and then comically outrageous. She cooks wiener schnitzel for the entire family, but eats it all herself; unsuccessfully attempts to poison the family beagle; and -- convinced that insects are attacking her during the night -- showers the plant above her bed with bug repellent, much to Martin's consternation.