The new girl in school, Rose, is a whiz at the computer and is even teaching Ellie. At first, Alison, Heather, Megan, & Keisha think she isn't interested in being friends. But then they decide maybe they have misjudged her and should get to know her better. The girls as Rose to join them on an adventure through the attic mirror.
Before they know it they are transported to a holiday party in a natural history museum. After sampling the treats, they decide to explore different sections of the museum. But suddenly they find themselves trapped when the museum closes.