Kirsten has always dreamed of being an explorer. But after her best friend Carmen moves away, she doesn't have anyone to go on adventures with. It's no use making a really good discovery if there is no one to share the excitement. So when her parents agree to adopt a puppy from Battersea Dogs & Cats Home, she can't wait to have a new doggy sidekick! Buster, the bouncy Labrador puppy, turns out to be the perfect pal. He just loves digging things up - especially the flowerbeds! But when the family decides to go on a camping holiday, can Buster unearth more than just trouble?