For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Campbell's hanging out in Israel writing a memoir. He revisits the time he spent hanging out in New York City while he dealt with the aftermath of what he did in Germany: he was a spy for the U.S., pretending to be a propagandist for the Nazis. He was really good at being a propagandist.
Act II
Campbell's in hiding at the place of business of a Nazi sympathizer who runs a newspaper spreading hate. It's okay, though, because Campbell is there with his brother-from-another-mother and his honey. But it turns out they're traitors and spies, after all.
Act III
Everyone's arrested except Resi (who commits suicide) and Campbell (who is released). Feeling fancy free but oh-so-numb because nothing matters anymore, Campbell breaks a guy's arm, turns himself in to the Israelis, and then makes plans to kill himself when it looks like he'll be freed again.