It's In His Kiss: Bridgerton: 7

When it comes to the Bridgerton siblings, Hyacinth is the youngest, wiliest, and most determined to uncover a mystery—especially when it involves the maddeningly aloof Gareth St. Clair. Julia Quinn delivers another sparkling Regency romp full of witty banter, family warmth, and that signature swoon-worthy chemistry. If you love clever heroines who refuse to play by the rules and heroes who don't stand a chance, this one's for you.