“Parasites” (*** out of four) was a taut, effective sleeper about a group of college students whose car breaks down on the wrong side of town and are stalked and pursued to the death by a relentless group of homeless guys and must try to stay alive and escape. Lean and mean action thriller is skillfully directed by Chad Ferrin even though it owes more than a bit to 1993’s “Judgment Night.” Final twenty minutes don’t have the same intensity as the rest of the film but film’s climax may strike a nerve with its topicality. Superb music score by Michael Olivo.