Carla Martin is leaving an English parochialboarding school for the summer to live with her estranged father at an inn in East Berlin. The headmistress, a nun, gives her a 1936 guide to Berlin, telling Carla that she may find it useful, even though Berlin has surely changed as much as she has. Her best friend, Sophie, gives her a bag of marijuana. Hugh Martin, her father, who lives on Central Park West, greets her at the Berlin Airport, surprised at how grown she looks. Carla is a bit embarrassed that he has given her a teddy bear, as she is nearly seventeen years old. She addresses him on a first name basis, and a camera pan reveals that he just bought the teddy bear at the airport. As they cross through the Berlin Wall, Carla is terrified that she will be personally searched and caught with drugs. Hugh has a thirty-year-old girlfriend named Lili, who recommends Frau Hoffman's inn because of the local character being significant to Hugh's historical research. Carla is convinced that there are rats behind the wall and wants to leave. Hugh has Frau Hoffman humour her and show her that there is merely a broom closet next door, though that room is not deep enough to convince her. Hugh insists it's probably just part of the next room. Carla sees flashes of another girl in the wardrobemirror, starts tapping the wall behind it and gets taps back, and tearing away at the wallpaper, she opens the wall to find a disused cold room, for the hotel was once a butcher's shop and home, and a Jewish dissident named Erich hiding inside. She begins sneaking him food from the hotel kitchen, along with utensils and her father's razor, to help him. Carla is experiencing two realities, one in the 1980s when she is Carla Martin and another in 1936, when she is Christa Bruckner. Christa is the daughter of butcher Wilhelm Bruckner, a member of the Nazi Party who calls her a "little slut" and rapes her in the night. Christa also has lines of cuts in both of her palms. Carla is ashamed by the rape and scrubs herself thoroughly in the bathtub. Hugh is concerned that Carla may be going insane like her mother did and finally makes good on his insistence at having her seen by a doctor. When the doctor comes, she has stripped the sheets on her bed for their dirtiness and is not wearing anything under the bed covers, so her father steps out for the examination. The doctor cannot find anything wrong, and when she tells him that her father raped her the night before and asks him to examine her, he sees only inflammation from the scrub brush and identifies her as virgo intacta—she was not raped. Christa and Erich begin lovemaking, as Christa fears she is pregnant by her father and psychologically needs to have the possibility that any baby born is Erich's. She carves their names into a cross centred on the letter I on the wall of the cold room. Soon after, Hugh finds her huddled in a nightgown inside the wardrobe, which is filled with rotten food. Hugh and Lili get her dressed and take her out of the hotel. As they are getting into the car, Herr Bruckner drags her back into the butcher shop and insists he needs her for deliveries. In reality, this is to give Frau Hoffman time to reveal Erich to the Gestapo. When they return, Moltke, who had previously interrogated her about a visit to a Jewish man referred to her by Erich, is waiting in her bedroom. Erich shot one of Moltke's men, and Moltke killed him. Hugh and Lili carry Carla back to the room with Frau Hoffman's assistance. When Carla regains consciousness, she begins accusing Frau Hoffman of having killed Erich. Not being able to tell Hugh from Herr Bruckner, she stabs him in the chest near the shoulder with a knife she has hidden. Coming to her senses, she and Lili ride with him in the ambulance. Hugh now with his arm in a sling, the police are called to open the wall behind the wardrobe, which Carla had never actually opened. The planks Herr Bruckner had sealed it up with are removed, and Carla investigates it, filled with rats as she initially suspected, discovering the place where Christa and Erich's names are carved into the wall. Frau Hoffman is unable to hide her shame. Hugh takes Carla back to the airport to live with her aunt, with whom she lived prior to boarding school.
