Paperback, 71 pages
Published March 25, 1999 by Scholastic.
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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.
Subjects
- Vikings -- Juvenile fiction.
- Monasteries -- Juvenile fiction.
- Middle Ages -- Juvenile fiction.
- Time travel -- Juvenile fiction.
- Magic -- Juvenile fiction.
- Tree houses -- Juvenile fiction.
- Jack (Fictitious character : Osborne) -- Juvenile fiction.
- Annie (Fictitious character : Osborne) -- Juvenile fiction.
- Vikings -- Fiction.
- Monasteries -- Fiction.
- Middle Ages -- Fiction.
- Time travel -- Fiction.
- Magic -- Fiction.
- Tree houses -- Fiction.
- Jack (Fictitious character : Osborne) -- Fiction.
- Annie (Fictitious character) -- Fiction.
- Ireland -- Juvenile fiction.
- Ireland -- Fiction.