No need to cover the plot beyond what has already been said. As has also been stated, in many ways this seems like a one-hour teleplay that has been expanded into a feature film. Though billed as a courtroom drama, most of the screen time is taken up with two romantic subplots and a third drama involving the relationship between Maharis and his mother (Jurado).
Maharis is bland as the lead, as are the two women in his life (this is more of a script problem than the actors' faults). Gene Hackman has a fairly small role as the sheriff, so doesn't really get to shine. The one standout, surprisingly, is Earl Holliman. He can often be hammy or wooden, but here he deftly alternates between sympathetic and despicable in the movie's one complex role.
The other standouts in the film are its period setting (early 1900s New Mexico), and the luminous photography by Robert Burks in his next-to-last film.