Almost forty years after the end of the war, Claire Baum opens a package from a stranger in Rotterdam, unleashing a flood of repressed memories from her childhood. As Claire delves into her past, she uncovers the personal sacrifice and bravery of her parents, the Dutch resistance and the families that selflessly gave shelter to her and her sister, Ollie. The Hidden Package portrays Claire's years spent in hiding and pays tribute to all those who played a part in saving her life and ensuring a future for the next generations of her family.