An old sailor's chest, and in it several stones decorated with runes and a diary - that's all that Sky inherited from his mysterious grandfather, who once went to sea and did not return. The rune stones contain great energy that has power over space and time , and Sigurd's diary is nothing less than the key to this power. Just as Skye begins to comprehend the meaning of the ancient symbols, the fate of the young Viking heir takes a sharp turn. He has a mystical double, capable of penetrating into the distant past and there incarnating himself into a formidable warrior. But rune magic is not given for nothing, it requires a bloody sacrifice...