The magic tree house carries Jack and Annie to New York City in 1938 on a mission to rescue the last unicorn.
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  1. Blizzard of the Blue Moon by Mary Pope Osborne (Random House, September 2006) [print · e-book].
  2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Mary Pope Osborne