This documentary isn’t so much about the actor Montgomery Clift as it is about the past efforts to write biographies that accurately reflect his life and working methods. Robert Clift, the actor’s youngest nephew, codirected the film with Hillary Demmon, and they spend much of the running time on the actor’s brother, who devoted his retirement to working with biographers so they could get their facts straight. Getting into the nitty-gritty of how biographies are composed, the filmmakers make one realize the difficulty of presenting a subject’s life in a fashion that adequately pleases the people who knew him. Their intense focus on this process can be frustrating—I yearned for more facts about Clift’s involvement in such classics as Red River, I Confess, and Wild River, though the passages about how he sculpted his performances in The Search and Judgment at Nuremberg speak to his impeccable craft.