I saw this for the first time recently.
The film is about a caring desert guide Hamilton (William S. Hart) who has been hired to lead passengers across a dangerous desert.
Hamilton is awaiting a train which has the passengers n also his younger brother who is a doctor.
Unknown to Hamilton, a crooked gambler has killed his younger brother on the train n made it look like an accident.
The gambler has convinced his sister that the accident happened due to her.
Hamilton guides the passengers including the murderer across the desert hoping to solve the murder of his brother.
The film has some top notch cinematography n acting, ther r no shootouts but a picture of a gun keeps popping up on the screen whenever ther is a talk about the murder.
Also the torture by the Red Indians is implied while they keep dancing around the fire the whole night.