The Irish Heiress by Kaitlin O’Riley

The Hamilton sisters have found true love to rival any novels sold in their famous London bookshops. And the story continues, as each of their offspring discovers the perfect partner . . .
Quiet and intuitive, Lady Mara Reeves has always felt more at home amid the green hills of her native Ireland than in London’s stifling ballrooms. Determined to remain single, she’s adept at gently rebuffing any suitor who comes her way. So why is she so drawn to Foster Sheridan, Earl of Sterling? It’s a connection unlike anything she’s ever known, yet complicated by one scandalous fact: the man she believes to be her destiny is already married . . .
Trapped in a loveless union with a woman who refuses to divorce him, Foster is resigned to loneliness until he meets the exquisite Mara. Her wants her as a wife, not a mistress, but he can’t resist her unconventional offer. Their passion is intense, as is the risk. For even as Foster follows Mara home to Ireland, their pasts will lead them toward danger that only the deepest love can overcome . . .