None of this seems superficial or done only for the sake of style judging from this synopsis of Michel Faber's novel (of the same title). Here's an excerpt:
SPOILERS
Isserley is an alien whose assignment on earth is to abduct male (preferably muscular and burly) hitchikers for their processing, in a subterranean area under a barn in Scotland where she and her fellow aliens are based, as farmed animals that are castrated, made mute by tongue-amputation and fattened up in pens like calves for their veal. After a few months, they are eventually slaughtered and butchered for meat and then transported back to Isserley's native land, which is portrayed as a dark, arid, unpleasant place where meat is a rare and expensive delicacy.
Vaguely canine in her original form, Isserley has had to undergo mutilating surgery to pass as a human whose day job is to drive on the A9 of Scotland picking up unsuspecting men and then, after sometimes quite interesting conversations, paralyzing them by flicking a switch that activates twin jets that come up through the front passenger seat injecting an immediately acting curare-like drug. Isserley then transports them back to the farm.
Pretty deep. I can't imagine the movie doing that plot justice but I'm looking forward to finding out.
