Twelve Ways to Trick Your Biggest Enemy (Genny in a Bottle, Bk. 3) : When it comes to her family, Sophie really doesn't fit in. Her parents don't understand her at all, and her non-identical twin sister, Jess, gets away with everything. Sophie needs some serious help - and gets it in the form of Genny, the world's coolest genie. There's just one hitch. Jess also has a genie on her side - Genny's mega-enemy, Rebecca. So now the sister fight is turning into a genuine genie brawl. Genny and Rebecca can only agree on one thing - that the world isn't big enough for the two of them! Ages 8 to 12.