So Melville wrote of his masterpiece, one of the greatest works of imagination in literary history. In part, Moby-Dick is the story of an eerily compelling madman pursuing an unholy war against a creature as vast and dangerous and unknowable as the sea itself. But more than just a novel of adventure, more than an encyclopaedia of whaling lore and legend, the book can be seen as part of its author's lifelong meditation on America.