In the Shadow of the Raven.

Trausti returns to Iceland just in time to be entangled in a family feud over a stranded whale-cadaver. His mother (the family head) is mortally wounded and Grim kills Erikur; the other clan leader. Isold, daughter of Erikur now takes his place. Isold and Trausti are attracted to each other, but Isold was promised to Hjoerleifur - the son of the Bishop (of Iceland) and his powerful wife. However, Isold has a plan...