His to Keep by Sherrinda Ketchersid

He’s fighting for his inheritance—she’s marrying her sworn enemy.
When Ian McGowan attempts to claim Whitfield Castle as his rightful inheritance, he finds himself barred by a tempestuous lass who is entailed to be the bride of the castle’s new owner.

Claire Beaumont, the orphaned ward of Whitfield, has good reason to hate Scots, and she is not about to let a Scot enter her beloved home. But when the handsome knight steals into the castle and proves his claim on the land, she must face her ultimate nightmare—marriage to her sworn enemy—in order to save those she cares about most.

Restoring the failing Whitfield Castle while wooing his defiant intended proves more challenging than Ian anticipated. His struggles reach a crisis when his nemesis arrives at the castle, and he must overcome his past demons to prove his worth. He must fight for what is his to keep—and it could well cost him his heart.