Reminding everyone that there are only five days until the Olympics end, Monday sketches the Reichsbank vault, detailing its elaborate defenses: a 150-foot electrified elevator shaft, a long hallway with an electrified floor, two live-in guards, and a combination door for which combination is set to the birthday of the bank manager’s son. Failure to disarm these measures properly triggers a deadly flood trap. Monday explains that Ursula and Karl’s athletic abilities will bypass the initial obstacles.

Evie’s role is to cross a 150-foot electrified hallway by swinging along ceiling bars spaced five feet apart. Evie briefly panics, but Karl’s unwavering confidence calms her. After Evie bypasses the hallway, they will rig pulleys for the others. Their target is the personal vault of Max Heiliger, an important Nazi whose identity is unknown to the team. The getaway vehicle will be a stolen Rundfunk television van.

Karl reveals that they will enter through secret underground tunnels connecting the Olympiastadion to the Reichsbank. However, Ursula admits they have not yet found the tunnel entrance. Monday outlines three remaining tasks: obtain the vault combination, steal the van (Evie and Karl’s job), and locate the tunnel entrance. He assigns search teams for the next day.

When Ursula mentions the Youth Services Hosts, Karl states that they are all spies for the Gestapo, the Nazi police force. Evie is shocked to realize that her own host, Heinz Fischer, is a spy. The conversation ends abruptly when they realize the group realizes that they are alone in the square. Suddenly, Karl spots a squadron of black-clad Nazi police marching toward their table.

As the Nazi police approach, Monday swallows the paper bearing his vault sketch. Ursula wants to run, but Karl reminds them that any suspicion of their guilt could lead to an arrest, which could mean being sent to a concentration camp. The police veer toward a cathedral, and the team agrees to split up. As Evie freezes in fear, Ursula pulls her toward the streetcar stop. As they wait, two German soldiers approach. Ursula draws a concealed knife, but Evie defuses the situation by acting like a loud American tourist and discussing the Olympics. The soldiers walk past.

On the empty streetcar, Ursula thanks Evie and explains that her father gave her the knife for protection. She shares that her father is a Black soldier from Senegal who served in the French army and met her white German mother in the Rhineland. Nazi propaganda vilified these soldiers, and Nazi race laws now criminalize children like Ursula who have a blended heritage. She reveals that she will give her heist money to the Rhineland resistance. When Ursula asks Evie’s motive for participating, Evie admits that she wants to get rich and feels selfish in comparison to her teammates.

Back at the Olympic Village, Evie spots Heinz waiting at the gate. Ursula distracts him while Evie climbs over the wall. Inside, Evie discovers an arbor that perfectly replicates the vault’s electrified hallway. After explaining its significance to Ursula, Evie attempts to swing across but is devastated when she falls halfway through.

Evie wakes, sore from arbor practice. Her roommate Mary Brooks is preparing for her equestrian competition, and Evie feels guilty for having to miss it to search for the tunnel entrance. Mary invites Evie to a party with Nazi officials that night. Learning that the head of the Reichsbank might attend, Evie asks Mary to let her know whether this is true, hoping for a chance to obtain the vault combination.

Evie tries to sneak out but finds Heinz on the streetcar, announcing that he will accompany her everywhere. She nicknames him Ketchup. To escape him before her meeting with Monday, Evie takes Heinz to the Deutschlandhalle to watch fencing. She admires filmmaker Leni Riefenstahl, who dismisses a Nazi official trying to move her camera crew. When the German fencer, Helene Mayer, wins, Evie makes a sarcastic comment about “Aryan” ideals, but Heinz reveals that Helene is Jewish. Evie is surprised Evie that the Nazis would allow a Jewish athlete on their team.

Noticing Heinz’s fascination with the new electronic scoring equipment, Evie leads him backstage, where technicians explain the wiring system. While Heinz is engrossed, Evie slips away unnoticed.

Evie meets Monday at the Olympiastadion, and they search the corridors beneath the stadium for the tunnel entrance, first checking the Funkraum, a large communications center that broadcasts multiple Olympic events on television screens. Evie briefly spots Mary competing and feels guilty for missing her event.

They enter the Langemarckhalle, a dark hall filled with shields bearing thousands of names. The hall commemorates the Battle of Langemarck, where teenage German soldiers were needlessly slaughtered in World War I. Their commander falsely reported they won while singing patriotic songs, and the Nazis perpetuate this myth to glorify dying for the fatherland, even though everyone knows it is a lie.

Monday expresses admiration for the Nazis and German commanders for their ruthless exercise of power. When Evie asks if he likes the Nazis, Monday explains that there are no good or bad people, only the powerful and powerless. He reveals his past, explaining that he was an orphan named by nuns and grew up poor, so he believes that Karl and Ursula are fools for planning to give away their money. He argues that to survive, one must become a taker, not a giver. Evie is disturbed by his cynical philosophy.

They fail to find the tunnel entrance.

On Day 12 of the Olympics, Heinz waits at Evie’s dorm, determined not to lose her this time. Evie must meet Karl to steal a Rundfunk van, so she tries losing Heinz in a crowded shopping district, but the presence of other Youth Services Hosts makes escape impossible. She pulls him down a quieter side street instead.

At a bus stop, Evie sees a Hitler Youth propaganda poster featuring a boy who looks exactly like Heinz, and he uncomfortably admits that he is the boy in the picture. Shocked, Evie realizes that Heinz is the literal poster boy for the Hitler Youth. The poster declares that youth serve the Führer and that all 10-year-olds must join the Hitler Youth. Heinz joined three years ago when Hitler became chancellor.

Evie briefly sympathizes but wonders why he seems upset about his prominent role. To create an escape opportunity, she decides to enter a nearby hat shop. Heinz tries to stop her, pointing to a Star of David on the window and stating that Germans are forbidden to shop at Jewish-owned stores. Angered, Evie enters, and Heinz reluctantly follows.

Inside the small, sparsely stocked Jewish hat shop, a young shopkeeper emerges from the back. Her surprise at seeing customers turns to horror when she sees Heinz in uniform, and Evie regrets using the woman to embarrass Heinz. After a tense formal exchange in German, Evie feels obligated to buy a hat. The atmosphere remains uncomfortable.

To escape, Evie asks to use the bathroom. In the back storeroom, she notices the empty shelves and wonders if the shortages affect all of Berlin or just Jewish shops. She bypasses the bathroom, exits through the back door, and climbs the fire escape to the roof. She successfully jumps from roof to roof, escaping Heinz.

Evie meets Karl outside a Rundfunk garage, where they hide and time the guard’s patrol. Karl explains the nearby lit apartments are empty façades for Olympic propaganda. Feeling the need to explain her motives, Evie tells Karl about her family’s Dust Bowl tragedy, revealing that they fled Oklahoma in a pickup truck loaded with everything they owned and drove through suffocating brown dust storms. Her younger brother John had dust pneumonia and coughed so hard he broke his ribs. Evie prayed for God to save him, but while they camped on the roadside, John died. Evie wants the heist money to ensure that her family never suffers like that again. Karl comforts her.

During a five-minute gap in the guard patrol, Karl boosts Evie to a second-story garage window. The guard rounds the corner while she is precariously positioned, but she freezes and remains undetected. Once inside, she lets Karl in. They load crates of camera equipment into a van, wait for the guard to pass, and drive away, celebrating. As they leave, Evie locks eyes with Heinz Fischer, who is standing on a nearby street corner.

Fearing that Heinz will report her, Evie returns to her dorm, where the team matron confronts Evie about her constant disappearances. Suddenly, Heinz appears, carrying the hatbox from the shop, and provides an alibi, claiming that she was shopping with him all afternoon. The stunned matron softens and warns Evie to be careful because there is more going on than meets the eye.

Now alone, Evie suspects a trick. She searches the hatbox for a listening device but finds only the hat. Agitated, she goes outside to practice on the arbor, debating whether to tell the others about Heinz and fearing that the news would cancel the heist. Distracted by these thoughts, she misses a bar and falls.

That night, Evie decides she must tell Monday about Heinz and get his help to investigate. She arranged a secret after-curfew meeting in a park. When Mary returns to their room, Evie pretends to sleep. After the matron’s check, Evie prepares to leave but discovers Mary is also dressed and sneaking out to an underground nightclub. Mary mentions that the head of the Reichsbank is throwing an official party tomorrow night; she invites Evie to tag along. Evie eagerly accepts, wanting to somehow obtain the vault combination from the head of the bank. She asks to bring a friend.

Evie sneaks to the park but feels conflicted, admitting that she and Heinz could have been friends under different circumstances. In the park, she spots Monday waiting on a bench. Before approaching, she sees another figure in the shadows: Heinz, dressed in black and sneaking through the park on his own secret mission. Realizing that this is an opportunity to learn the truth, Evie decides to follow Heinz instead of meeting Monday.

Evie follows Heinz as he moves cautiously through foggy, deserted Berlin streets. In a small courtyard with a bronze statue, Heinz turns suddenly. Evie barely manages to hide behind the statue’s pedestal. Heinz spots something that frightens him and runs back toward the statue, so Evie circles to the opposite side to avoid him. She hears footsteps and realizes that Heinz was hiding from a Nazi policeman who is now walking toward the courtyard.

Evie freezes as the Nazi policeman passes the courtyard entrance, close enough to touch. He lights a cigarette and tosses the spent match near her feet but never looks in her direction. After he leaves, Heinz peeks out from behind the statue. Evie ducks back into hiding before he sees her, then continues following him.

As they proceed, Evie recognizes the street where she ditched Heinz earlier. She hides behind the propaganda poster featuring Heinz’s own face. Heinz stops in front of the Jewish-owned hat shop. Fearing that he has returned to make trouble for the shopkeeper, Evie runs toward the shop, no longer trying to hide. When she arrives, Heinz has vanished down a narrow alley. Believing that Heinz plans to cause trouble, she runs down the dark alley after him.