In the dialectic between established “certainties” and fundamental ambiguities that characterise north Atlantic islands, Kristjan Ahronson develops the argumentation on the relationships between Scots, Irish, and Norsemen of the early medieval period. The interaction of humans and their environments, as well as peoples’ migrations and the cultural diffusion in the north Atlantic, are the main areas of investigation of a book that is intended to be designed not only for a specialized audience. Popperian theory of science and interdisciplinarity represent the conceptual framework in which the author develops his method or, even better, his crossing of methodologies that are jointly employed to reach a multidimensional pictures of the subjects under inquiry.