Ombre!

After capturing "Bimbo" Sullivan, a shady arms dealer, Zagor and Chico meet the engineer Robson, who is busy building a railway, on which Chinese labor is working. However, the engineer complains about the sudden and inexplicable abandonment of many workers. Shortly thereafter, upon reaching the coast, our heroes discover that a group of raiders with strange customs are attacking merchant ships along the coast of Virginia. They are led by the bloodthirsty Chinese Ly-Cieng, who enlists his fellow countrymen who immigrated to the States and are exasperated by the racism of the Americans. But not all Chinese support him...