Today's clue from the New York Times crossword puzzle is : Book that might require a key to open First let's look and see if we can find any hints in the New York Times crossword puzzle. Then we will gather any relevent information we need in order to find the correct answer to the clue Book that might require a key to open that has been given in the New York Times crossword puzzle. Finally we will list any possible answers here below for the clue Book that might require a key to open.