Their magic tree house takes Jack and Annie back to a monastery in medieval Ireland, where they try to retrieve a lost book while being menaced by Viking raiders.
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nyt:series_books=2007-03-10Jack (Fictitious character : Osborne)Tree housesVikingsMonasteriesAnnie (Fictitious character : Osborne)FictionNew York Times bestsellerIrelandAnnie (Fictitious character)
