Nellie Sue, who fancies herself a real cowgirl, wants a horse for her birthday, but she discovers that a brand new bicycle--her first--takes almost as much taming as a filly.

A brother and sister's struggle to delay bedtime is transformed into a playful dance with their parents.

From having to leave her cowgirl hat at home to being seated between the rambunctious "J-twins," a brand new day in a brand new class is not going Nellie Sue's way, especially with her best friend, Anna, being nice to new girl Maya.

As she rides her bike up and down steep slopes, a little girl reminds herself that if she just keeps moving she will eventually climb her mountain.