Lady Caroline Lamb was described by her lover, Lord Byron, as having a heart like a "little volcano" and as "the cleverest most agreeable, absurd, amiable, perplexing, dangerous fascinating little being that lives now or ought to have lived 2000 years ago." She wrote witty and revealing letters to fellow writers like Lady Morgan, William Godwin, Robert Malthus, and Amelia Opie, and to her publishers John Murray and Henry Colburn, to her cousins Hart,...