The old Tree by Tricia Martin
It's summer and Mike has a new neighbor, Mari. He has been to the park many times and has seen something strange with the old tree.
He starts discovering more about it and goes inside the tree where it appears to be huge inside-much larger than the outside depicts. He shares the secret with Mari and she also goes inside to investigate.
An old family friend Bob has come to visit with her father and he's part of the old tree as well. They travel to his world and become acquainted with their ways and how to defend with things they are given.
They meet many others, in different forms and follow their lead to the battle-to rid the world of evil. They are not to despair and must have hope to win all battles..
Mike loved his new adventure and can't wait for the next one...
Loved the descriptions and the action involved.