'My empire is of the imagination.' These are the words of Ayesha, the mysterious white queen of a Central African tribe, whose dread title, 'She-who-must-be-obeyed', testifies to her undying beauty and magical powers; but they serve equally well to describe the hold of her author, Henry Rider Haggard, on generations of readers. Writing 'at white heat', and in the flush of success after the publi...