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!