Around the world in eighty days in style! This proud claim, made by the Carcharodon Shipping Company, is about to be put to the test as its newest and most magnificent submersible cruise liner, the Neptune, sets sail on its maiden voyage around the world. Among the great and the good who have been invited to join this historic cruise is Ulysses Quicksilver, dandy adventurer and hero of Magna Britannia, enjoying a well-deserved sojourn after the traumatic events of Queen Victoria's 160th jubilee celebrations. But something is waiting in the depths. Something that threatens the Empire itself!