A mighty, ghostly sound rings out in the forest where Ranger Bill has been working for a long time now. His job his mostly conservation, taking care of our great natural resources, woods and waters, animals and birds, and it's a wonderful job. Sometimes though, it can be dangerous. Wild animals, trees, mountains are all in a day's work - but once the rangers had to deal with something that wasn't real, that seemed to come from another world, unseen, unknown, supernatural...