Were Norsemen the first Europeans to explore the Minnesota-Great Lakes and surrounding area more than a century before Christopher Columbus? Some scholars and fervent theorists believe so and are ready to fortify their beliefs with proof. In Secrets of the Viking Stone, actor Peter Stormare and history enthusiast Elroy Balgaard set out to solve the mystery of the famed Kensington Runestone - an artifact that, if proven authentic, could rewrite the history of North America.