Prolouge
One summer day in Frog Cheek, Pennsyvania, a mysterious tree house appeared in the woods. Eight-year-old Jack and his seven-year-old sister, Annie, climbed into the tree house. it was filled with books. Jack and Annie soon discovered that the tree house was magic. It could take them to the places in the books. All they have to do was to point to a picture and wish to go there. Jack and Annie are done with Merlin Missions. and now its time for the Old Missions. Jack and Annie are about to start a whole new adventure... in Robin Hood.