Scab McNally (real name: Salvatore Wallingford McNally) has a twin sister named Isabelle. Scab's mission in life is to annoy his sister and make her life miserable. Of course, she keeps a list of all the naughty things he does each day and presents it to their parents at dinnertime. Scab really wants a dog, and tries to get Isabelle's help to convince their parents that it's a good idea.  However, Scab's latest invention is a stinky perfume that he calls "Isabelle's Smell." and he is using the money he gets from the perfume sales to try to buy a dog. When Scab realizes that Isabelle isn't very happy at school - no one is sitting with her at lunch, she doesn't talk to people - he starts to realize that something is the matter. Will Scab be able to help his sister and figure out what's wrong? Borrow this book and find out.