Fritz Peter Buch (21 December 1894 â 6 November 1964) was a German screenwriter and film director. He worked frequently during the Nazi period, with one of his plays, Einmal Mensch (Once a Person) being performed by the German unit in NYC of the Federal Theatre Project; Buch worked less in the post-war years. He directed Zarah Leander in one of her comeback films Cuba Cabana (1952), in what proved to be his final directorial effort.