مجموعه مجموعه قصه های نانسی درو ، کتاب 2 : پلکان پنهان

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The Hidden Staircase is the second volume in the Nancy Drew Mystery Stories series written under the pseudonym Carolyn Keene, published in 1930 and revised in 1959. The original text was written by Mildred Wirt Benson, and she has said that it is her personal favorite of the Nancy Drew Books she wrote.