Ever since Charlie lost her best friend Betsy the dog, life hasn't been the same. But then Ben the fox terrier turns her world upside down. Not only is Ben nothing but trouble - he's also invisible. And that makes Charlie's life very complicated, especially as no one will believe that Charlie herself is not eating other students' lunches and leaving nasty puddles on the floor. Charlie has to unravel the mystery of why an invisible dog is following her around, before her parents disown her and she accidentally gets expelled. And along the way, she will have to find a way to say goodbye to Betsy. A humourous, easy to read chapter book targeted at ages eight to twelve.