Zen, an autistic teenage girl with powerful martial arts skills, gets money to pay for her sick mother Zin's treatment by seeking out all the people who owe Zin money and making them pay.
When gelatinous blue aliens fall from the sky and threaten their lives, neighbors at odds with each other must put aside their ongoing feud.
The Inspector Wasan, a cop under investigation by internal affairs but called back to duty to investigate the murder of a minister's daughter. He's joined in the investigation by Sergeant Thong and the young female officer Lieutenant Nalin, whose investigative style is the opposite of Wasan's. Meanwhile, the killer has Wasan in his sights, setting out to ruin him by exposing his role in a previous case.
