Plot
The 17 year-old Shell lives an isolated life at a remote petrol station in the highlands with her father, Pete, who is a mechanic. She is lonely, with her only interactions coming from the station's customers. She has two regular customers, young sawmill worker Adam and divorced salesman Hugh. She has to care for her epileptic father, although Pete repels Shell's incestuous advances towards him.
One night, Pete and Shell help a couple, Robert and Clare, who have accidentally hit a deer. The next morning, Pete strips the deer to be used as venison, while Robert and Clare realize their car is too run-down to be used again and opts to rent a car instead. Clare converses with Shell, who reveals that her mother left when she was four and she stopped school when she was younger, and has been living with her father ever since. Clare gives Shell the book she was reading before she and Robert bid her goodbye.
Pete returns home from taking the couple's car to the scrapyard and admits to Shell that he went to a pub. As he washes himself, Shell attempts to seduce her father, but he rebuffs her instead. That night, when the boiler gives out, Shell climbs into bed with her father.
Hugh arrives after a failed weekend visiting his sons and gifts Shell a new pair of jeans. However, Hugh's repressed lust for her takes over and he hugs her for too long, so Shell forces him off her. The guilt-ridden Hugh quickly leaves without properly saying goodbye. After Hugh leaves, Shell approaches her father again as he repairs the heater, but he chastises her for touching him intimately.
Adam arrives to invite Shell out. Shell invites him inside where he meets Pete. Adam has lost his job due to being suspected of a break-in at the sawmill he worked in. He describes some of his own family issues and says he is considering setting up a similar operation to Pete's, or working with Pete, but Pete rebuffs him. Adam and Shell drive off and have sex in Adam's car.
A young mother and child stop off to use the petrol station's toilets and the child leaves her doll behind. Shell runs off after the car to return the car, however Shell instead opts lie in the roadside heather, against a backdrop of the loch and the craggy Beinn Ghobhlach, before returning home.
Shell returns to the petrol station to find Pete having another fit. While convulsing, he bites Shell badly. As he recovers from his fit, Pete professes his need for his daughter, and Shell reiterates that she will stay with him. They kiss and are about to have sex before Shell stops him. They fall asleep, but Pete wakes up in the middle of the night and, guilt-ridden for kissing Shell, throws himself in the way of a passing lorry. Shell awakens due to the accident and is distraught by her father's suicide.
Adam comforts the grieving Shell and stays with her. In the morning, a lorry arrives for fuel. Abandoning Adam, Shell goes off with the driver, without plans of where to go. The closing credits roll over shots of the Destitution Road.
