All Eyvind has ever wanted is to become one of the greatest Viking warriors - a Wolfskin. But his friend Somerled, a strange and lonely boy, has his own plans for the future. They begin with an oath of brotherhood, which Eyvind swears to prove to Somerled that he has an ally. Years later, Eyvind is obliged to accompany Somerled and a group of settlers to the beautiful islands rumoured to lie across the western sea The expedition begins badly with a tragic event and something tells Eyvind that it may not have been an accident In spite of these beginnings they reach the islands, and the new settlement is a harmonious one. Then one day, a brutal murder occurs. Now Eyvind begins to feel the binds of his boyhood oath, and realises what sort of future Somerled had in mind for himself all those years ago