Erin and Nana are going to the park today. There are so many things to do at the park that you can always count on having a great time. Erin is excited because she knows she will get to enjoy a special adventure. As soon as she sees her friend Charlie the squirrel waiting for her, she knows she's in for an extra special surprise.

There's a magical tree at the park Erin goes to with her Nana, and in that tree there is a tiny red door. It's so small that she could never fit through. It's a good thing, though, that Charlie the squirrel can shrink her with his magical wand, for through...