Bucket and Delroy are really excited - they're off on a camping trip to Yosemite with Bucket's dad. Yosemite: home of huge trees, wild animals (like, er, grizzly bears ... eek ) and - as Bucket and Delroy discover - a strange and unexplained phenomenon involving some freaky fireworms that are destroying the Californian redwoods. Bucket thinks his dad's going to need some help figuring this one out...