The Chieftain's Curse by Frances Housden

Euan McArthur is a chieftain in need of an heir.

While still a young a warrior, Euan incites the fury of a witch. She retaliates with a curse that no wife will ever bear him an heir. As he buries his third wife and yet another bonnie stillborn son, Euan can no longer cast her words aside.

Morag Farquhar is a woman in need of sanctuary. With a young relative in tow, Morag flees the only home she has ever known to escape her brother, Baron of Wolfsdale, and find sanctuary in the MacArthur stronghold. Pronounced barren by a midwife, Morag is of little value to her family, but a Godsend to Euan, a lover he can’t kill by getting with child.

Years ago, chance drew them together, and tangled their lives in ways they could never have imagined. This time their destiny lies in their own hands, but it will take courage and strong hearts to see it through to the end.