After her sister is raped and murdered, Lily Wong dedicates her life and ninja skills to the protection of women. But her mission is complicated. Not only does she live above the Chinese restaurant owned by her Norwegian father and inspired by the recipes of her Chinese mother, but she has to hide her true self from her Hong Kong tiger mom who is already disappointed in her daughter's less than feminine ways, and who would be horrified to know 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 team up with a mysterious-and very lethal-stranger to rescue them.