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
Volume 1: from the introduction of our major players (Dagny and Hank) to the dramatic exit of Ellis Wyatt.
Act II
Volume 2 Colorado fails, things get worse, and Dagny's fate is uncertain after a dramatic plane crash.
Act III
Volume 3: we learn of the strike and meet John Galt. Romantic relationships are all readjusted and finalized and our heroes manage to escape as the country collapses.