"The Castle" follows the Kerrigan family, who live in a modest house in the suburbs of Melbourne, right next to the airport. The family includes father Darryl, mother Sal, and their three children, Tracey, Dale, and Steve. Despite the noise and proximity to the airport, they are happy with their home and feel a strong sense of belonging to their community.
However, their peaceful lives are disrupted when the government and airport authorities decide to expand and build more runways, leading them to acquire the Kerrigan's property through a compulsory acquisition order. The family is devastated at the prospect of losing their home, which holds special memories and sentimental value to them.
Darryl, who works as a tow truck driver and holds a deep respect for the law, is determined to fight for his home and takes the case to court with the help of a small-time lawyer named Dennis Denuto. Despite facing powerful opponents and the odds stacked against them, the Kerrigans mount a spirited legal battle to protect their rights and their home.
Through their fight to remain in the house they love, the Kerrigans showcase the strength of family bonds, resilience, and the importance of standing up for what is right. "The Castle" is a heartwarming comedy-drama that celebrates the ordinary people and the everyday heroes who find courage in the face of adversity.