After her sister is raped and murdered, Lily Wong dedicates her life and ninja skills to the protection of women. She has to hide her true self from her Hong Kong tiger mom, who is already disappointed at her less-than-feminine ways, and who would be horrified if she knew what she had become. But when a woman and her son she escorted safely to an abused women's shelter return home to dangerous consequences, Lily is forced to not only confront her family and her past but also team up with a mysterious, and very lethal, stranger to rescue them.