Sundown in Santa Fe (1948)

A dagger has been left in every robbery by Walter Durant, fugitive leader of the President Lincoln murder ring. Rocky is sent to Santa Fe to find Durant and arrest him and the gang of outlaws he controls. Rocky soon finds that the information for every robbery comes from Tom, who is the son of the sheriff. But Rocky has to arrest the whole gang, and he does not know who is part of the gang and where Durant may be hiding.