There is some good tension and action to be had here - and a couple of unexpected turns of event - as we go undercover in the vicious world of people-smugglers who treat their freight like trash - 'helping' them cross the border to US farms (with complicit farm owners) only to be robbed clean on the way back. Our two stalwart cops (Ricardo Montalban and George Murphy) infiltrate different ends of the operation, having to dodge suspicion, collect intel, as well as keep in contact with headquarters - and each other; not easy when you have creepy and brutish thugs running hell-on-wheels through the wilderness and an unscrupulous kingpin (Howard Da Silva) pulling the strings. I enjoyed the novelty of the setting (some desolate locations in the desert) and plotting - and the leads make for convincing officers of the law; the cinematography improves greatly in the latter half of the movie and there are some memorable outdoor shots and scenes. Certainly there is an noirish atmosphere of cynicism, hopelessness and menace, and the high stakes and constant tension make it pretty enjoyable. Not amazing but not bad either.