The story follows the travels and exploits of its main character, Sigtrygg, as he and his crew sail from Greenland to seek a place they have heard of in legend, Vinland. When they arrive in what we know as North America, they are called upon to help one of the local tribes deal with a bullying warlord.
The "original article" link below goes to the U.K. page on Amazon.com; the U.S. link (see below) is also available. Reader-written reviews are available on the Amazon pages.
U.S. Amazon.com (same information as the U.K. link)