In the heart of Chinatown, New York, an ornery, chain-smoking, newly-widowed 80-year-old grandma (Tsai Chin) is eager to live as an independent woman despite the worry of her family. When a local fortuneteller (Wai Ching Ho) predicts a most auspicious day in her future, Grandma decides to head to the casino and goes all-in, only to land herself on the wrong side of luck--suddenly attracting the attention of some local gangsters. Desperate to protect herself, Grandma employs the services of a bodyguard (Corey Ha) from a rival gang and soon finds herself in the middle of a Chinatown gang war.