At the beginning of the story Jack and Annie were in Frog Creek, Pennsylvania. Then they went to Frog Creek woods, and went to the tallest oak tree, and saw the Magic Tree House. They climbed up into the tree house and they saw a leaf that had writing on it. They wished to go whereever that leaf came from. The leaf said on it, "To Jack and Annie of Frog Creek, On All Hallows Eve, look for me in the heart of the oak. —M."
When they arrived at the castle's forest they climbed down the rope ladder and circled around the tree trying to find the center of the oak. Jack saw a crack in the tree and tried to pull it out and it opened into a big doorway. They went in and saw Merlin, the magician, who had written the letter on the leaf. Merlin gives Jack and Annie instructions to go to the castle and find the Diamond of Destiny for the people inside the castle. He tells them that they will have a messenger to go with them. They discovered the messenger was their friend Teddy, from four earlier adventures.
When they get to the castle, they go up all the stairs, they go into the nursery and find a chess board moving on it's own and a knitting wheel moving on it's own. Their friend Teddy, the sorcerer, turns them into ravens and gets the Diamond of Destiny back from the Raven King. Then they go and put it back in it's holder and really they were always there but invisable, now they are visable and Jack and Annie go home.
This book was really fun and I recommend it. My favorite part was when Teddy, Jack and Annie turn into ravens.
