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Nancy attempts to solve the mystery of strange tapping sounds in the house of a retired actress. Who is the tapper? How does he gain access to Miss Carter's house, despite securely locked doors and windows? Why do the tapping sounds come in Morse code? While trying to learn the answers to these and other puzzling questions, Nancy finds her investigations complicated by the dishonest administrator of a will and a thief who steals Miss Carter's prize Persian cats.