Four seasoned men of the Roman legions are sent to Britannia, with orders from Caesar himself, to scout the land and to assess what forces would stand in the way of any invasion. Setting foot on this dark isle is dangerous enough, but what unfolds is a fight for survival against the unknown. Mysteriously they are also tasked by an anonymous source to find someone, and they soon discover that they are not the only ones searching. With allegiances tested, bonds broken, and the fate of Brittania hinging on their actions, their belief in everything they know shatters as they encounter a new world where the enemy is everywhere, and nothing is at it seems.