In a world where history and fantasy collide, a group of European mercenaries ventures through the vast and mysterious China in search of gunpowder. However, what initially seems like a simple trading journey turns into an epic struggle for survival when they encounter the Great Wall. They soon discover that it is not just a defensive structure, but the last line of defense against monstrous creatures that threaten to devour humanity: the Taotie, voracious beings that resurface every few centuries.
Led by a tenacious captain and aided by skilled and brave Chinese warriors, the group finds themselves caught in a colossal and relentless battle. As they forge unexpected alliances and confront their own fears, the true nature of their mission is revealed: they must not only survive but also protect millions of innocents from impending destruction.
As the mercenaries become immersed in the military strategy of the wall's defenders, they realize that their skills are essential for achieving victory against the looming threat. The story transforms into a blend of action, drama, and magic, as they race against time and their own inner demons. Ultimately, each character must ask themselves how far they would go for the sake of humanity in this confrontation between courage and sacrifice. All of this unfolds against an impressive backdrop that is an architectural masterpiece.