Unable to bear the pain of his loss, Joseph decides to take matters into his own hands. He becomes a vigilante, determined to bring the culprits to justice. Using his army skills and training, Joseph starts to track down and punish those responsible for his daughter's death.

"Masterpiece" received mixed reviews from critics, with some praising Mammootty's performance and the film's action sequences, while others criticized the story and screenplay.

The movie explores themes of justice, corruption, and the failures of the system. It highlights the struggles of an ordinary person who becomes a vigilante to seek justice for his loved ones.

The movie begins with Joseph Pauly (Mammootty) living a retired life with his family. His daughter, Anu, is a bright and innocent young woman who becomes the victim of a heinous crime. The local police and administration fail to take action, and Joseph's daughter dies under mysterious circumstances.