Bob Valdez is an honourable but tired Mexican lawman who finds himself at odds with the unpleasant, racist and cowardly Frank Tanner, a gun runner with a band of hired enforcers. 

LOCATION
Rambla de Tabernas

SCENE
(Title Sequence) A stagecoach wends its way slowly down the track with Bob Valdez riding shotgun.

LOCATION
Rambla de Tabernas

SCENE
The stagecoach trundles through a canyon.

LOCATION
Rambla Bujo

SCENE
It finally stops where a motley gathering of Tanner's men and picnicking families is taking pot shots from behind the safety of some rocks at a cabin in the gulley below. 

SCENE
Tanner insists that the man in the cabin below is a deserter, a murderer and is definitely black.

LOCATION
Rambla Bujo

SCENE
Valdez ponders the situation and decides to intervene. He takes cover behind a rock and tries to talk the fugitive out. He succeeds only to find that Tanner has encouraged one of his gang to shoot the man anyway. The shot misses but Valdez has now to defend himself against the alleged criminal and he shoots him dead - a tragic mistake for the man was innocent.