Annie and Sarah are sisters that live in Nebraska and go to Midvale School. Every day they walk over a mile across the prarie to their one room schoolhouse made of sod. Their teacher Miss Freeman helps the sixteen students in class, learn to read, write, and spell.
On January 12, 1888, Annie and Sarah head to school as usual. When the students go outside for lunch, they notice that the weather is changing. Huge clouds are rolling across the prarie, and icy cold wind is whipping around the school