Summary:
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.
In constant physical pain from the surgery and the unnatural upright posture, and always questioning herself, her role on earth, her feminity amongst the otherwise all male alien workforce, Isserley falls in love with the earth's natural world (there are not oceans or lakes on her world), especially Scotland's lochs, rain, cloud and snow. Sheep hold a special place in her heart.
Amlis Vess, the son of the owner of the company that is selling earthmeat at exorbitant prices back home, shows up for an unnannounced site visit and curiosity since he is ideologically opposed to this killing of animals - he has no idea how sentient and intelligent earthlings are and this fact is carefully kept secret from him during his brief visit, which is also marked by his marvelling at earth's natural beauties and what appears to be an emotional or sexual attraction to Isserley.
After some rough handling by one of the hitchhikers who attempts to rape her, her troubling interactions with Amlis Vess, news that the police have taken notice of a missing hitchhiker and are conducting an investigation, and her discovery that there may be a replacement for her in the offing - Isserley decides to strike out on her own. The end of the novel is, although not shocking, not expected.
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