Duke Kallen de Lewelton is bloodthirsty and ruthless when it comes to killing criminals, but a total sucker when it comes to his new daughter! Peasant girl Lae learns this herself when a fateful run-in with the duke results in her adoption into the Lewelton home. Armed with a sharp mind and the knowledge from her past life, Lae makes the perfect addition to the family’s quest to quell injustice. But as the mysteries of the capital’s underbelly rise to the surface, will she and her new family withstand the return of a true criminal mastermind?