With the Great War raging across Europe, Sergeant Jones and his crack team of Special Unit 13 Marines are called upon to investigate the strange disappearance of allied aircraft north of France in the mountains of Belgium.

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 13's efforts on the ground.

Can they survive long enough to eliminate the threat and secure the battlefield from the Kaiser’s massing forces?