The story begins in the early 11th century. Our protagonist (Robert) visits a sailship bound to North America, full of Vikings and commandeered by Lief Eriksson, son of famous Erik the Red. Robert tries to explore more about Viking culture and finds himself trapped in that time-space with no possible way to get back to his own time-space. He tries to use his knowledge to make Vikings win, a lot of battles one after another and eventually gets settled with them making a lot of powerful friends. But more suspense is about to be unveiled in further chapters, so be patient...