The War with the evil Agalum rages on, but now there's a new player in the game. With the Cagliostro embarking on its most dangerous mission yet, a run behind enemy lines to uncover a long hidden cache of weapons designs within the heart of the Agalum Empire, the stakes have never been higher. But now Mark Johnson and his brave crew aboard the Cagliostro must deal with the dreaded threat of the mysterious Tahir Ga'Warum, the interdimensional aliens who have come to our universe seeking conquest and subjugation. The threat has never been greater as the Cagliostro and its crew must first find and secure the information that could turn the war permanently in the Agalum's favor before their dreaded enemy can decipher it all, and then they must deal with not only the threat the Agalum pose but that of the monstrous Tahir Ga'Warum as well. It's a race against time for not only Mark Johnson and the crew of the Cagliostro, but for all of Earth itself and the very existence of the human race