Alison, Heather, Keisha and Megan find a key that unlocks a trunk in an old Victorian house. When they wear the clothes in the trunk, they are transported to an adventure in the past.
Dejected when the class hayride that she helped organize is cancelled because of rain, Megan consoles herself with a trip to Ellie's attic where the magic mirror transports her to ancient Greece.
Rose travels through the mirror in the magic attic to a Cheyenne village in the mid-1800s, where she discovers many customs of her ancestors, meets a pioneer girl, and has her courage tested by a raging prairie fire.