One child. Two years in hiding. Three lives in mortal danger.

In Nazi-occupied Amsterdam, near Anne Frank's house, another Jewish girl is hidden. Her name is Elli. Her father has been executed at Mauthausen concentration camp. Her mother is fleeing for her life. Elli is next.

To save her, resistance couple Frits and Jo Hakkens must risk everything, concealing her in a secret space above the ceiling. With shrewd cunning and unflinching courage, they outwit the Gestapo, survive relentless searches and face betrayal from those they once trusted.

By night, Frits forges ID papers; by day, he sabotages warplanes at the Luftwaffe plant. Jo works in the shadows, aiding Jewish fugitives and smuggling underground newspapers through a city crawling with enemy patrols.

But, with the Germans closing in, how much longer can they hold out?