In the unsettling landscape of post-World War II, Maja Reid (a Romanian refugee) grapples with her tumultuous new life alongside her husband, Lewis, and their young son, Patrick. Yet, the specters of her past persistently haunt her, manifesting in relentless nightmares that echo the horrors she has endured. One fateful day, while wandering the streets, Maja's attention is drawn to a man resembling a former German soldier she encountered 15 years ago. Compelled by instinct, she follows him to his home and observes a façade of normality, with a wife and two children stirring unease within her.
As days go by, Maja's wartime memories resurface with alarming clarity, ignited by recurring visions of trauma and loss. She opens up to Lewis, sharing the harrowing tale of her flight from Romania, where she and countless others faced brutal violence at the hands of SS soldiers. Maja's revelations are met with a blend of concern and astonishment; she confesses that she has taken extreme measures and has feared she apprehended a man she suspects to be a Nazi war criminal, Thomas Steinmann – or so he claims.
Securely confined in their basement, the suspect becomes the target of Maja’s feverish inquiries, as she confronts him about his identity and the atrocities he allegedly committed. Despite Thomas's fervent protests of innocence, asserting he is merely a Swiss native, Maja remains resolute, convinced she has captured one of her wartime foes. Tensions escalate when Thomas attempts a desperate escape, calling for help, only to be thwarted by Lewis.
The next day unfolds with unexpected complexities as local law enforcement, including a neighbor named Jim, canvasses the vicinity regarding the mystery of Rachel's missing husband and investigates the unsettling events of the previous night. To further confound Maja, Lewis reveals that he has unearthed documentation at work indicating that Thomas Steinmann is indeed from Switzerland, shattering Maja's certainty and thrusting her into a whirlwind of doubt regarding her actions.
With accusations flying, Thomas adamantly asserts his innocence against Maja's claims of his wartime misdeeds. Maja's persistence leads to a poignant moment when she forces him to admit a deeply painful term he used during the war, evoking the brutal reality of the horrors inflicted by German soldiers on innocent victims. The narrative unfolds through visceral flashbacks, bringing to light atrocities like the horrific assault Maja’s sister, Miriah, suffered, etched forever in Maja's memory. As Lewis presses Thomas about his involvement, Thomas maintains he was in Zürich during the war, providing names as his alibi. However, more truths unravel as it becomes evident that he has since claimed U.S. citizenship through marriage to Rachel, revealing his deceitful past.
A fateful visit to Rachel's home unearths another unsettling discovery for Maja regarding a ring engraved with a Star of David, which she believes Thomas stole from a Jewish victim. This revelation intensifies Maja’s resolve to extract the truth from him. When the confrontation escalates, Thomas resorts to violence to silence Maja, albeit unsuccessfully, as she continues to demand a confession about his wartime deeds.
Meanwhile, Lewis strategizes to release Thomas, trusting he wouldn’t report them, while Maja's relentless pursuit of justice drives her to Rachel again, only to glean more cryptic information regarding Thomas's refusal to discuss his past.
As tensions reach a boiling point, Maja and Lewis orchestrate a dramatic confrontation near a pit they excavated on the fringes of town, demanding that Thomas kneel at its precipice. With her finger poised on the trigger, Maja threatens him with dire consequences if he doesn’t provide an honest confession. The burden of her past floods back as memories of witnessing unspeakable horrors during the war engulf her.
Finally, overwhelmed with guilt, Thomas collapses under pressure, candidly confessing to his misdeeds, revealing the grim reality of soldiers ignited by drugs and desperation as they scrambled under the pressure of advancing forces. His admission confirms Maja's worst fears that she did not abandon her sister, culminating in the chilling moment when he uttered, "I did it." This propels Lewis into a frenzy, leading him to take drastic action against Thomas.
In the aftermath, Maja and Lewis endeavor to bury their sinister secrets beneath a façade of domestic normalcy, joining Rachel and friends in a Fourth of July celebration as they scrub their basement, indicating a desperate attempt to compartmentalize their dark history.
