What do a colony of ancient Vikings carved out by Indians in the vicinity of modern New York, a mysterious submarine surprisingly reminiscent of Captain Nemo’s Nautilus that plied the seas and oceans at the end of the 19th century, the transnational corporation Cerberus and a brilliant scientist-inventor have in common? who tragically died during a fire on the luxury cruise ship “Emerald Dolphin”? Only this restless couple can answer this question, and at the same time save the residents of the largest city in the United States from death and bring criminals to light! Dirk Pitt and Al Giordino, constant heroes of almost all of Clive Cussler's novels, are once again helping humanity out.