The Wistful and the Good - Cuthbert's People, #1

Before the Vikings set foot on English soil, the Northern kingdom of Northumbria knew a golden age, an age of artists and poets, of scholars and saints. Elswyth of Twyford was the golden child of that golden age, blessed with beauty, charm, and a gift for entertaining and peace-making in the halls of great lords. Though her father's name has never been heard in the counsel of kings, Elswyth is promised to an Ealdorman's son and will one day host kings at her table.
But in the year of grace 793, the peace of Northumbria is shattered by the vicious Viking raid on its greatest jewel, the rich monastery of Lindisfarne. People ask if God himself has abandoned them, and great lords thirst for any chance to spill Norse blood. And Elswyth finds herself caught between old friends suddenly cast in the image of devils incarnate, and the lust for vengeance of the man she is to marry.
One false step could lead to the loss of the promised marriage and the death or enslavement of people she loves, both English and Norse.