An American boy, Cody, Henry Thomas, whose parents have died, lives in Australia with his guardian, Gazza Tony Barry. Cody is imaginative, inventive, and endlessly curious, spending long hours in his garage tinkering away and turning scraps into useful creations, including a railbike that helps him zip around his new home.
Nearby, the eerie atmosphere of Devil's Knob National Park sparks Cody's imagination as he learns about ancient Aboriginal legends—the Frog Dreamings and the Bunyips, mysterious water monsters said to prey on people. The rumors intensify when strange, newsworthy events swirl around a lake that locals claim is home to a bunyip named Donkegin. As the stories unfold, a second myth—the Kurdaitcha Man—takes shape in the background, a shadowy figure said to roam the countryside at night and act as a perilous, archaic judge who punishes offenses against the land and its creatures. In the telling, the Kurdaitcha Man is imagined as an older Aboriginal man wearing emu-feather shoes, a detail that creeps into Cody’s dreams and questions.
One day, after the lake center erupts into bubbles, Cody discovers the desiccated body of Neville, a homeless man, in a nearby tent. The local police sweep in and conclude Neville likely died of a heart attack, offering little more than a conventional explanation. But Cody is not satisfied. He fashions a rough, makeshift diving suit from scavenged gear and descends into the murky depths, intent on uncovering what really lies beneath. The moment he dives, however, he fails to resurface, and fear grips the town. In response, the locals decide to drain the lake to recover what they fear is Cody’s body, and the mystery deepens.
Witness to Cody’s possible fate is his close friend Wendy Rachel Friend. She pieces together clues from Cody’s aquarium—an air toy—and a book on old mining equipment, recognizing a pattern that suggests Cody might still be alive. Wendy rallies help and brings in a diver team to search the pond, driven by a mix of worry and curiosity.
As the divers descend, the lake begins to bubble and seethe once more. Donkegin erupts from the depths, snatching Cody in its jaws and lifting its head in a cry that sounds almost like a rusted, ancient engine. The scene is revealed to be tied to something far older and more mechanical than a mythical monster: Donkegin is, in fact, an old donkey engine—a type of steam-powered excavator once used in construction. The lake is a flooded quarry, and the bottom holds a surprising jumble of discarded items—cars, bicycles, oil drums, and more—that have sunk with time. The locals manage to pull Cody to safety, and the perceived monster of the waters is gradually dispelled, though the legend persists in the collective memory.
The Kurdaitcha Man myth resurfaces in Cody’s dreams, where he seemingly witnesses the old man intently involved in the Donkey-Engine’s task, almost guiding it back toward the pond. The figure’s portrayal—an elder Aboriginal man with the feathered shoes—adds a haunting layer to the film’s mystery and its interpretation of ancient law and punishment.
In the end, the adventure closes with Cody and his friends safe and sound, even as the Kurdaitcha Man and Donkegin linger in their minds. The story leaves behind a sense of wonder and a reminder that some mysteries, born from myth and memory, can still feel very real while remaining unspoken truths in the landscape they inhabit.
