The book you are referring to is titled (Ten Ways to Be Adored When Landing a Lord) by Sarah MacLean . It is the second installment in the Love By Numbers (El amor en cifras) series .

Lady Isabel Townsend is a woman with secrets, an impoverished estate, and a younger brother to protect. She has no interest in love, but she desperately needs the help of a man like Nicholas.

Beyond the romance, it explores themes of family responsibility and the struggle of women in a society that limits their agency. Key Quote: