Forbidden (1984)

In Berlin in the early 1940s, romance is forbidden between the young countess who is studying veterinary medicine and a young man she meets at the home of a former professor. But they fall in love. She gets involved in helping Jews escape from the Nazis. All get out of Berlin except the young man. There is a room in her apartment where he can't be seen through the windows and a chest converted into a sofa where she and her brothers played hide-and-seek as children. This real life hide-and-seek game has high stakes. The movie is said to be based on a true story.