My Sister Is the Warlord Queen

Abandoned by their parents, the Blackwood sisters Catherine and Grace learned early that they could only count on one another. Both grew up to build lives they were proud of. At Grace's engagement party, Catherine arrives straight from an undercover job still wearing her janitor disguise, and the guests mock her without mercy. When Grace is betrayed and humiliated by her fiancé, Catherine drops the act and reveals she is the Warlord Queen.