Premise: Marshal of Amarillo is a 1948 American Western film directed by Philip Ford and written by Robert Creighton Williams. The film stars Allan Lane, Eddy Waller, Mildred Coles, Clayton Moore, Roy Barcroft and Trevor Bardette. The film was released on July 15, 1948, by Republic Pictures.
Hypothesis: the film Marshal of Amarilo was a bestseller in 1948