Indomitable Perry Mason and his confidential secretary Della Street are puzzled by the gormandizing of young, voluptuous Dianne Adler. Dianne, the aforementioned blond bonanza, is guzzling as if she'd just received word that the doomsday machine was half-cocked. Dianne tells Perry that she has contracted to model clothes for the ""healthy"" woman and she must gain fifteen pounds. Further investigation reveals that a red herring has been tossed to Dianne by a missing heir outfit convinced that she is about to come into a great deal of money. Blackmail, extortion, and murder ensue and the usual trial clears the whole mess up. Typical Masonry.