With the Great War raging across Europe, Sergeant Jones and his crack team of Special Unit Thirteen Marines are called upon to investigate the strange disappearance of allied aircraft in the North of France. Pilot, Lance Corporal Jackson and his gunner/bombardier, Sous-Lieutenant Marcel Moreau, find themselves deep behind enemy lines, fighting for their lives against an evil and ancient airborne threat in support of Special Unit Thirteen's efforts on the ground. Can they survive long enough to eliminate the threat, and secure the battlefield from the Keiser's massing forces.