High in the remote Welsh mountains, five builders are brought together to renovate a sprawling old farmhouse. Housed in mouldy portacabins, tensions soon simmer between the men and the self-entitled aristocratic homeowner as well as amongst the ragtag group of men themselves. World-weary old-timer Dave and kindly foreman Bob try to keep the peace, but his nephew Steve falls under the malign influence of bigot Jim, the pair taking a dislike to Viktor, a Ukranian labourer. As the weather closes in and payments are late, tempers fray. Blood is spilled. As the blue-collar men are confronted with an increasingly dark spiral of moral choices, Jim makes an astonishing proposition.

Un barbier de Glasgow devient, malgré lui, un tueur en série...