While grieving the loss of their mother, Gabriella, siblings Norman and Anna uncover a shocking truth: they were adopted, and their biological mother, Mary, resides in the isolated Australian town of Two Heads Creek. Upon their arrival from overseas, they quickly discover that Mary owned all the local businesses, which leads them to encounters with various townsfolk. One local, Hans, expresses a strong desire for the siblings to leave, initially fabricating lies that Mary had passed away long ago. Once exposed, Hans alters his tale to claim she died the day before, with a funeral arranged for the following day.
As night falls, a disturbing incident occurs when Norman is stabbed by one of the locals. Daisy, another resident of the town, insists that the attack stems from the belief that Norman's birth caused a plague, leading to the death of all the local pigs. It becomes apparent that Mary sent Norman and Anna away, fearing that the townspeople would seek revenge against them.
The next day, during the funeral, Norman's suspicions escalate when he notices discrepancies in the corpse compared to a photograph of their mother. His unease deepens upon seeing an immigration officer from the airport in town, leading him to dig up Mary’s coffin, only to find it empty. Meanwhile, while Norman grapples with these revelations, Anna prioritizes her interest in the inheritance and leaves the town.
In Norman's desperate attempts to uncover the town’s secrets, he learns of a sinister truth: the residents are involved in a gruesome scheme to eliminate immigrants, turning them into sausages for consumption—a plan that the Australian government seemingly benefits from. While attempting to rescue some captured tourists, Norman finds himself apprehended and rendered unconscious. In his haze, he catches a glimpse of Daisy also being held captive.
Upon regaining consciousness, Norman finds himself amidst the town's chaotic Australia Day festivities, where the locals indulge in cannibalistic practices. Just as the situation appears dire, Anna returns to rescue her brother. Confronting Hans, Norman learns the shocking truth that Hans is indeed their father, but before they can fully grasp this revelation, Hans is killed by another townsman.
As the drama unfolds, Mary finally appears, revealing that the townspeople resorted to cannibalism following the demise of the pigs, only to discover they relished the experience. Mary had remained silent out of concern for Daisy’s safety, who is, unbeknownst to them, also her daughter. Although she sent Norman and Anna away for their protection, she has always been proud of their achievements, staying informed about their lives.
After a climactic showdown, only Mary and her children survive the confrontation against the townspeople. The film concludes on a hopeful note, as the reunited family sets out to launch a vegan food truck, symbolizing a fresh start and a commitment to life beyond the horrors they encountered.
