Little Rosie Wilder is perfect at everything. She can sing and dance, she plays several musical instruments, and her I.Q. is so high it's off the scale. So how did Claudia "C-" Kishi get stuck baby-sitting for Rosie the genius? It's because Rosie is so obnoxious that no one gets along with her--not even Claudia's sister, who's a genius, too. The Baby-sitters think that Rosie needs to be taught a good lesson. But maybe what Rosie really needs is a good friend . . . like Claudia.