The Baby-Sitters Club Wiki
The Baby-Sitters Club Wiki

Claudia and the Genius of Elm Street is the 49th book in The Baby-Sitters Club series by Ann M. Martin.

Back Cover Summary[]

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? Because Rosie is so obnoxious, 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 what Rosie really needs is a good friend... like Claudia.


Ann M. Martin's Dear Reader Letter[]

Dear Reader,

In Claudia and the Genius of Elm Street, we meet Rosie Wilder for the first time. Rosie is not based on anyone I know. She’s completely made up. However, when I was young, just like Rosie, I enjoyed taking lessons and being involved in activities. When I was very little, I took ballet lessons and several different kinds of art classes. I was not a talented dancer, but I loved the art lessons. When I was in third grade, I began taking piano lessons, which I also loved, and continued for years. In middle school, I took exactly two tennis lessons and quit — tennis was not for me. In high school, my interests changed. I began doing a lot of volunteer work and tutoring — interests that continued throughout college. Now, as an adult, instead of doing volunteer work, I have my own foundation. I also like to cross-country ski. But guess what my favorite activities are — sewing, needlework, and crafts. I guess those early lessons paid off.


  • This is the first time we learn Claudia's middle name.
  • This is the first appearance of Rosie Wilder, who appears sporadically throughout the rest of the series.