The Illegitimate's Gambit: Rising to Mistress

In her past life, Helen Goodwin was given to her brother-in-law as a concubine when her legitimate sister became pregnant. Unexpectedly, the day her sister gave birth was also the day Helen met her demise. Reborn into a new life, Helen schemed her every step carefully. First, she won over her brother-in-law's influential father, securing her desired marriage into the Duke's household as the mistress. Then, she reclaimed her position as the legitimate daughter and unleashed her power!