Attacked by the powerful Fuma clan, young Moonshadow and the agents of the Grey Light Order fight for their lives. In the heat of battle, one of their number disappears. Was the Grey Light Order agent abducted by the Fuma or did they leave willingly? Was there a double agent in their midst? Moonshadow and Groundspider are ordered to the Fuma's mountain fortress, said to be impregnable. Their mission: discover the truth, then act accordingly. Will their dangerous quest end in a rescue? Or will Moonshadow be forced to destroy a trusted friend?