During the first quarter of the 10th century, the mighty Sitric, a Danish Viking of the line of Ivarr the Boneless carved out a kingdom in Ireland, slaughtering and enslaving as his longships ruled the waves and his warriors conquered the land. Then he set his sights on the city of York, threatening the power of the Saxons and Angles, and stirring the interest of the Britons and Scots. Entering this whirlwind travelled young Olaf, son of Muire a Christian of the Western Isles and a former consort of Sitric. Being Sitric's son, the father he had never seen, Olaf becomes the pawn of his cunning maternal grandfather Thurferth who seeks to gain advantage by presenting Olaf to Sitric at York. Olaf, a young but clever and resourceful native of the Western Isles of Scotland, has to adapt quick as schemes and counter-schemes swirl around the court of York, and when Sitric dies suddenly, Olaf is elevated as a contender to his father's kingdom. From the south comes Athelstane, King of Wessex and Mercia, from the north comes Owain, King of the Strathclyde Britons, as well as Constantine, King of the Scots, whilst Olaf's uncle Guthfrith arrives from Ireland. And in the Western Isles, Eric Bloodaxe, a prince of Norway seeks to become ruler of all the Vikings of the western seas. Caught in the middle of wars and political conspiracies, to survive Olaf will need to evoke the blood of Ivarr the Boneless that flows hot through his Viking veins.