Manit (Jon Foo) witnessed the murder of his parents when he was just 10 years old. The killers shot him in the head, but he miraculously survived. However, the damage to his brain left him unable to experience regular human emotions. A martial arts master saved him and took him in. Twenty years later, Manit has become a master of martial arts himself. He returns to the scene of the crime, seeking justice.
Simon is a nine-year-old autistic boy who has cracked the government's new "unbreakable" code. This skill renders the new billion-dollar secret code vulnerable, especially if enemies of the United States should learn of Simon's abilities and capture him.
Julian, who runs a Thai boxing club as a front organization for his family's drug smuggling operation, is forced by his mother Jenna to find and kill the individual responsible for his brother's recent death.
The story of Kat Stanton (Kidman), an Australian woman searching for her father who, whilst travelling back from London to Australia via Thailand, makes friends with Arkie Ragan (Ehlers), a photographer.
The movie is centered on a couple, Nader and Simin, and their 11-year-old daughter, Termeh. Nader and Simin are about to leave the country for good; however, Nader has a change of heart and decides to stay and look after his father who suffers from Alzheimer's disease.