Captain Martin Stone commands a highly skilled, elite group of Allied soldiers in an assault on an enemy stronghold. However, they misjudge the enemy’s power and are swiftly driven back into the woods. While attempting to reorganize, they are unexpectedly ambushed by the very soldiers they had just defeated moments before. Compelled to retreat further into Russian lands, they uncover one of the war’s most horrifying secrets and come to the realization that they have awakened a much more formidable foe.