Franklin Shepard is a talented Broadway composer who abandons his theater career and all his friends in New York in order to produce films in Los Angeles. The story begins at the height of his Hollywood fame and moves backwards in time, showing snapshots of the most important moments in Frank’s life that shaped the man he is today. A live recording of the 2024 Tony Award-winning Broadway revival of Stephen Sondheim and George Furth's musical, filmed at the Hudson Theatre in New York City.

Inspired by the true-life experience of its star George Takei, Allegiance follows one family's extraordinary journey in this untold American story following the events of Pearl Harbor. Their loyalty was questioned, their freedom taken away, but their spirit could never be broken.

In the summer of 1953, Margaret Johnson, the wife of an American businessman, is touring Italy with her daughter, Clara. While sightseeing, Clara—a beautiful, surprisingly childish young woman—loses her hat in a sudden gust. As if guided by an unseen hand, the hat lands at the feet of Fabrizio Naccarelli, a handsome Florentine, who returns it to Clara. This brief episode, charged with coincidence and fate, sparks an immediate and intense romance between Clara and Fabrizio. Margaret, extremely protective of her daughter, attempts to keep Clara and Fabrizio apart.