Heart in the Highlands by Heidi Kimball

An arranged marriage was never what Callum Darrington, future Duke of Edinbane, imagined for himself. But with the well-being of his uncle’s family hanging in the balance, Callum strikes a bargain with his father and reluctantly agrees to tie himself to a stranger. The reality of the lovely Lady Katherine is more than he could have hoped for, and their wedding heralds a bright new future for the couple—until Callum discovers his father deliberately deceived him. Callum lashes out, setting in motion heartbreak not even he could have foreseen.

Four years later, Callum is ready to piece together the marriage he so carelessly destroyed. But their years apart have hardened Kate: she is not the naive and trusting young woman she once was, and she has no intention of allowing Callum a foothold in her life or her heart. Despite her coldness, Callum works to regain her trust and rebuild their marriage, not realizing Kate harbors a secret that could change everything—and this time, there is much more at stake than just her
heart.