When a struggling student teacher assigns a group project, seven-year-old Just Grace gets so involved in working with Grace W. and Grace F. that she fails to understand why she and her best friend, Mimi, are drifting apart.

Grace can do a lot of things...but can she save the planet? Or at the very least, can she help her best friend Mimi get her favorite stuffed animal back? Lots of exciting things are happening to Grace and her friends. Most exciting of all, Mimi's older cousin Gwen is coming to stay with Mimi, and Miss Lois's class is going green! For their "green" project, Grace and Mimi aim to inspire their friends and classmates to conserve plastic bottles. But...

When her teacher announces that the class will be putting on a play, Grace hopes she will win the part of the forest fairy queen.

Count on third-grader Grace to cook up a creative compromise just in time to save the day at the cupcake-themed school fair.