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Wilma Gregson (Kathryn Givney), imperious owner of the Gregson Cannery Company, is outraged when details of a secret merger with Super Brand Foods is made public. It turns out that the information was accidentally leaked by Wilma's little granddaughter Sandra (Chrystine Jordan) while corresponding to her pen-pal. Refusing to take Sandra's age and innocence into consideration, Wilma threatens dire conseuqences to the girl and her parents--thus setting herself up as a perfect candidate for murder. Accused of the crime is family friend Karen Ross, whereupon Sandra begs Perry Mason to defend Karen in court. Inasmuch as the hearing takes place in San Francisco, Mason's usual nemesis Hamilton Burger is supplanted by the local DA, played by Everett Sloane.