Caroline Tate

The most useless and obnoxious thing in the world to Caroline Tate is her older brother, J.P., the genius with the photographic memory. But now, for the first time, she needs him. She needs him because upstairs in the fifth-floor apartment of their building is a mystery man who plans to commit a terrible crime-and she and J.P. are the targets! Luckily, Caroline's best friend, Stacy, wants to be an investigative journalist, so she knows how to gather evidence. Together, Caroline, Stacy, and J.P. set out to catch this criminal red-handed before he can pull off his dastardly deed!

Caroline and J.P.'s father has asked them to come visit him and his new wife in Des Moines, Iowa. They don't really want to go, but they also don't have a say in the matter. Upon arriving, they discover they each have unexpected and unpleasant responsibilities. Caroline has to babysit their baby twin sisters and J.P. is forced to coach baseball to a bunch of six-year-olds. The two decide to call a truce in their continual sibling warfare and help each other out. They soon discover there's strength in numbers-and a little responsibility isn't always a bad thing.