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 a far more important issue is that Gwen has taken a strong liking to Mimi's favorite stuffed toy, Willoughby. Just Grace uses her empathy superpower to figure...