The table nods solemnly before marching onward to Topic A: the billion-strong swarm of Muslims who are poised to take over the world. The idea that Europe is being "taken over" is the unifying theme of this cruise. Some people go on singles' cruises, some on ballroom-dancing cruises. This is the Muslims Are Coming cruise. Everyone thinks it. Everyone knows it. And the man most responsible for this insight is sitting only a few tables down: Mark Steyn. He is wearing sunglasses on top of his head and a bright shirt. Steyn's thesis in his new book, America Alone, is simple: The "European races"--i.e., white people--"are too self-absorbed to breed," but the Muslims are multiplying quickly. The inevitable result will be "large-scale evacuation operations circa 2015" as Europe is ceded to Al Qaeda and "Greater France remorselessly evolve[s] into Greater Bosnia." He offers a light smearing of dubious demographic figures--he needs to turn 20 million European Muslims into more than 150 million in nine years, which is a lot of humping--to "prove" his case.