Joe is off on a school trip to an adventure park, and he can't wait to put Uncle Charlie's survival tips into practice! But it's not long before he's visited by Dexter, a scruffy-looking dog, with a howling tale of woe. Dexter doesn't want his owner feeling guilty for his death, but it'll be hard for Joe to help this time - it turns out that the owner is Joe's headmaster, the dreaded Mr. Hill!