It's in His Kiss (Bridgerton Series #7) (With 2nd Epilogue)

Meet Our Hero . . .
Gareth St. Clair is in a bind. His father, who detests him, is determined to beggar the St. Clair estates and ruin his inheritance. Gareth's sole bequest is an old family diary, which may or may not contain the secrets of his past . . . and the key to his future. The problem is—it's written in Italian, of which Gareth speaks not a word.

Meet Our Heroine . . .
All the ton agreed: there was no one quite like Hyacinth Bridgerton. She's fiendishly smart, devilis…