Thorvald, at the age of 18 years, has just been told about his true parentage. He immediately sets on a mission to find his father, with the help of his friend, Sam, an experienced sailor. What Thorvald doesn't expect is that his other friend, Creidhe, stows away on the boat and isn't found until it's too late to turn back. So the three journey together where they come across the Long Knife People. After hearing their story, Thorvald and Sam decide to stay on and help. Thorvald also believes that Asgrim, the leader of the Long Knife People is his father, so he decides to become a great warrior to make him proud. What he doesn't realize until too late is that Asgrim had other plans for Creidhe and when those plans go awry, she is thought to be dead. Instead, Cheidhe is on the Isle of Clouds, the exact place where the Long Knife People fight year after year to find Foxmask, the seer of their enemy. Thorvald makes it his mission to train the men to become true warriors and return Foxmask to his rightful place. On his journey, Thorvald learns about power, hope, sorrow, love and the importance of family.