After a storm dashes their longboat to pieces and strands them behind enemy lines, a crew of Viking raiders must cut through the harsh, unknown territory to reach the safety of Viking stronghold Danelagh. The journey becomes a race for their lives when the King of Alba sends his most feared mercenaries after them. With the help of a kind Christian monk who preaches with his sword, the group led by Asbjörn (Tom Hopper of TV's BLACK SAILS) lays brutal and ingenious traps for their pursuers to fall into one-by-one.