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The case remains unsolved of the burning death of Elfrieda Knaak in the basement furnace of the Lake Bluff police department on Oct. 30, 1928. There were severe burns on her head, arms and feet, when she was found nude in the furnace room. There were two false confessions — three, counting Knaak’s claim: “I did it myself.” Yet she changed her story several times before dying, four days after someone did something to the attractive 30-year-old book saleswoman and Sunday school teacher.
