Three troubled students—Dean, Duncan, and DJ Beatroot—are whisked away to the breathtaking Scottish Highlands by their teacher, Mr. Carlyle, in pursuit of the Duke of Edinburgh Award. This prestigious accolade requires its recipients to successfully navigate the rugged terrain relying solely on a traditional paper map. They are joined by Ian, an academic overachiever eager to enhance his college applications with the award.
As they embark on their journey, Mr. Carlyle drives off in a minibus, instructing the boys to convene at a pre-designated campsite. Though initially hesitant, the boys’ spirits are lifted when Dean reveals he has brought along hash. Unbeknownst to them, they are being watched through a rifle scope by a mysterious figure.
During their trek, the boys encounter a farmer plowing his field. After gathering directions, DJ Beatroot hands the farmer his mixtape CD. Later, they cross paths with a man clad in high-class hunting attire and seek his assistance, only to realize with horror that he wears a mask and begins shooting at them. In their frantic escape, the dazed boys speculate that this must be the "Duke of Edinburgh." In a ridiculous turn of events, the clumsy Dean and Duncan manage to concoct a trap, accidentally setting the "Duke's" leg ablaze, forcing him to flee.
Upon reaching the campsite, they discover Mr. Carlyle nursing a burn on his leg. Mistaking him for the Duke, Duncan panics and unintentionally runs him over with the minibus. The boys, in a frenzy, decide to stage an accident by sending the minibus tumbling off a cliff with Carlyle’s body inside. However, they soon realize the vehicle begins to roll back down the hill, prompting Duncan to suggest it’ll likely fall off a cliff anyway, allowing them to proceed.
While this chaos unfolds, local law enforcement—Sergeant Morag and PC Hamish—find themselves in a comical predicament as they search for a notorious bread thief, only to receive an incorrect report about Duncan being a terrorist loose in the area. They rush to the boys’ last known whereabouts.
The boys encounter the Duke once more, this time accompanied by his psychotic sword-wielding wife, the "Duchess." They are horrified to realize that Mr. Carlyle is not the Duke after all. As they flee, Ian falls into a ditch, getting separated from the rest. DJ Beatroot, frustrated, heads for a nearby barn while Dean and Duncan opt to hide in a cave, where they indulge in powdered soup.
Inside the barn, DJ Beatroot is startled to find a large group of farmers who have become fans of his work—the same farmer they encountered earlier has been promoting his mixtape. Taking advantage of the situation, he decides to stay and performs an impromptu concert. Meanwhile, the Duke and Duchess capture Ian; hearing his desperate cries, Dean and Duncan, smeared in powdered soup, race to his rescue. Just when it appears that all hope is lost, DJ Beatroot and his newfound farmer friends storm in and manage to chase away the Duke and Duchess after seizing their weapons.
The following morning, the boys resolve to confront the Duke and Duchess. They corner the striped villains on a shoreline, confronting them as the Duke and Duchess claim that youths today are too spoiled and require culling. Dean fiercely responds that adults have devastated the world, leaving the younger generation to deal with the consequences. Suddenly, additional masked hunters join forces with the Duke and Duchess, holding the boys at gunpoint, preparing for execution. Just then, the minibus inexplicably rolls off a cliff, crashing onto the hunters and eliminating the threat.
Relieved, the boys peek inside the minibus and find Mr. Carlyle alive—albeit barely. After some makeshift medical treatment, he pops up and scolds the boys for the attempt on his life. Shortly thereafter, Sergeant Morag and PC Hamish arrive on the scene. As Carlyle tries to explain the bizarre incident, Hamish discovers a stash of stolen bread in the back of the minibus, unveiling that Carlyle himself is the very bread thief they’ve been hunting. The boys cleverly cover for him by claiming that the van belonged to the now-crushed hunters. In appreciation for their discretion, Carlyle agrees to award the boys the Duke of Edinburgh Award, and they are celebrated as unexpected heroes.
