Denmark, 1940. War has come and everyone must choose a side. For British-born Kay Eberstern, living on her husband Bror's country estate, the Nazi invasion and occupation of her adopted country is a time of terrible uncertainty and inner conflict. With Bror desperate to preserve the legacy of his family home, even if it means co-existing with the enemy, Kay knows she cannot do the same. Lured by British Intelligence into a covert world of resistance and sabotage, her betrayal of Bror is complete as she puts her family in danger.