The illustrations are fun, but the story is a bit flat.  It basically show’s Nina following her ears through the woods, each sound leading her to a new group of friends who is up to something, but they all seem to be acting a bit strange/secretive.  In the end, she hears them all gathering for a surprise party for her birthday.  Basically it seems like a story that’s already been done, without something to make it stand out from the crowd.