It's Ella's best friend, Jess's, birthday and she's feeling especially homesick. Jess waits eagerly for a birthday parcel to arrive from her family, but when nothing comes in the post she feels very down. Ella and her other friends want to do something to cheer Jess up - so they plan to make a magical glitter bomb as a birthday surprise! But the magical surprise doesn't go quite to plan, and when Ella over-packs the bomb with glitter it makes such an explosion that it destroys a priceless statue at the school. Will Ella get away with her naughtiness? Or will she get expelled? Will they discover what's happened to the missing post?