Moby Dick is the story of Captain Ahab's quest to avenge the whale that 'reaped' his leg. The quest is an obsession and the novel is a diabolical study of how a man becomes a fanatic. But it is also a hymn to democracy. Bent as the crew is on Ahab's appalling crusade, it is equally the image of a co-operative community at work: all hands dependent on all hands, each individual responsible for the security of each.