| Location | Main Location |
| Model | Hardcover, 2007 |
| Product Code / UPC | ISBN: 978-0375830372 |
"In this exciting new Merlin Mission, Jack and Annie go back in time to New York City, during one of the darkest periods in the city's history - the Great Depression. Even worse, the city is in the grip of a terrible snowstorm. To stop the blizzard, Jack and Annie must save the unicorn made famous in the Cloisters' medieval tapestries. But will that be enough to help a city that faces so many troubles?
Ever since Annie and Jack discovered their unique Magic Tree House, they've adventured across the world and through time — taking countless readers along for an effortless learning experience that builds knowledge of history, geography, and culture while inspiring and encouraging curiosity."
Lexile Rating: 570L
Quantity - 12