Miep Gies, a young, carefree secretary, agrees to help her boss Otto Frank hide his family after the Nazis invade Holland. Summoning courage she didn't know she had, Miep faces her first task.

As laws against Jews intensify, two small children land in Miep and Jan's care. While Jan forges his own ties to the Dutch Resistance, Miep distances herself from people she cares about, including her own family.