Erin and her dog Zig go out to play like any other normal day, but it turns into a day they will never forget. They end up finding a portal to another world, beginning an amazing journey. She must discover the meaning of a poem carved into a rock and follow the clues to find their way back home. Along the way, they meet a meerkat riding on a cheetah's back, play chess with a wise tortoise, and slide with river otters through huge hollow tree branch slides. These unusual characters help them on the path through the wondrous world inside the shimmering doorway.