The Bliss of Mrs. Blossom stars Shirley MacLaine as Harriet Blossom, the wife of a moderately successful British brassiere manufacturer Robert Blossom (Richard Attenborough). When Harriet's sewing machine breaks down, her husband decides to save a few quid by sending one of his own employees to fix it. That employee is Ambrose Tuttle (James Booth), to whom Harriet takes such a fancy that she hides him in her attic, there to make love to her whenever she is so inclined. Her husband's "delusion" that he hears noises in his attic leads to a nervous breakdown, but the hidden Mr. Tuttle comes to the rescue by passing along stock tips which turn Mr. Blossom into a millionaire. When he finally does learn the truth, Mr. Blossom generously allows his wife and her lover to remain together -- and even presents Tuttle with his bra factory as a gift!