Attending high school in Steamboat Springs is Ida Bidson’s dream—it’s her next step toward becoming a teacher and her best shot at escaping a life of milking cows. It’s 1925, and from using telephones to attending movies, Ida is thrilled by her new experiences in Steamboat. She and her school friends even form a club, the Secret Sisters, to celebrate everything modern. But when they accidentally antagonize the strict, traditionalist principal,...