Not really sure what to say. First off, not knowing anything about the story besides the title, I didn't find the 'Mexican' exteriors very convincing: it looked too much like a cute Spanish village to me and the agaves were way too wilted. Just didn't look anything like the border I knew. (Hint: the flora was all wrong)
Second, could Steiger's character been any less sympathetic? I get this is something of the point, but other than his relationship with Dolores (besides being a name, means "pains" in Spanish), it's not easy to care much for this guy or his plight. I also find his German ancestry intriguing: why especially did he have to be German (though granted this was made a little over a decade after the capitulation of the Nazi state)?
And then there's money: his, theirs, and that which other characters covet and what they'll do for it. It's rather easy to root for those getting rich from a proper soaking.
A reasonable thriller that is well-constructed and paced if one can get past the unsympathetic lead (and those around him). Given that this was made for the UK market, most viewers probably won't notice or care about the unconvincing exteriors, but lacking a compelling story, I could only go for 7 stars.