The magic tree house takes Jack and Annie to Antarctica to search for the fourth secret of happiness for Merlin.
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  1. Eve of the Emperor Penguin by Mary Pope Osborne (Random House, September 2008) [print · e-book].
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Mary Pope Osborne