Joseph, a retired New York City detective, travels to Nuremberg for a visit with his son Ronnie. The two have been estranged since Ronnie ended his career with the NYPD to become an actor, but Joseph is seeking reconciliation following the death of his wife. Ronnie is married to Anna, an artist, and lives in an apartment complex that is also home to two elderly tenants, Ernst Shrager and Frau Ganz. When Joseph arrives at the apartment, he becomes convinced that Shrager is Vogler, the SS officer who murdered his parents and siblings during World War II. Ronnie doubts these claims until he and his father find Nazi items in Shrager's apartment, along with a passport identifying him as Ernest Otto Volger. Following this revelation, Joseph develops a plan to take vengeance on Shrager. The film also depicts Joseph's time on the run from the Nazis in Poland. In the flashbacks, Joseph meets a Polish girl named Kashka who falls in love with him. Sarah Bolger, the character's actress, stated in an interview that Kashka "is interrogated, tortured, and killed to save the person she loves", which is also confirmed by the soundtrack. Aided by a reluctant Ronnie, Joseph kidnaps Shrager and takes him to a remote area to enact his revenge. The soundtrack confirms Shrager's death and the film concludes with a final twist.