Izzy and ZoÞe love playing dress-up... with Izzy's puppy! The two best friends dress Rollo up in baby clothes and walk him in a doll carriage, waiting for Something Awful to happen. It always does. The Baby Stealer (a.k.a. ZoÞe's older brother, Lionel) comes along and snatches him! And then the girls chase the thief until everyone collapses in a fit of giggles and barks. But one day, Lionel won't join in the game anymore. All he does now is play video games and speak in grunts. Rollo has been changing, too. Not only is he growing out of the baby clothes, he keeps doing things that get him into a Very Big Amount of trouble. Izzy realizes that Lionel and Rollo have something terrible in common now -- they're teenagers! Is there a cure for being a teenager? Izzy is going to find out!